Zexoguy/Zexo87 also wrote this one. Since the finale completely focused on Belos' ultimate downfall, there wasn't really any official closure on the fates of the secondary villains that didn't get redeemed, especially for a certain lousy mother. So here's how I imagine it.
With Emperor Belos destroyed and his reign of terror finally over for good, the entire Boiling Isles rejoiced and celebrated. A grand party was held in Bonesborough with music, dancing, games, and feasting, with everyone having the time of their lives. And after the party was over, it was time to begin rebuilding the Isles. Many changes would have to be made to ensure that the Isles became a place of freedom and prosperity for all. Therefore, a council was established to oversee those changes. A council made up of many of the heroes who had helped to defeat Belos, including Luz Noceda, Eda the Owl Lady, Amity Blight, Willow Park, Gus Porter, Hunter the former Golden Guard, Lilith Clawthorne, Raine Whispers, Darius Deamonne, and Eberwolf. King had been asked to join, but declined due to no longer desiring power over people. However, he did agree to serve as a council advisor.
Before the party, the council had instructed the now redeemed and reinstated Warden Wrath to capture all of the biggest troublemakers on the Isles, like Kikimora and the former coven heads Terra, Adrian, and Vitimir, and lock them up in prison so that they wouldn't spoil the party, or worse, try to take over the Isles for themselves. Now, one of the council's first orders of business was to hold a trial for each of their prisoners and sentence them for their crimes.
Once all the other prisoners had been tried and sentenced, the only one left was Odalia Blight, the former head of Blight Industries and mother of Amity and her siblings. Though, calling Odalia a mother was extremely generous since she had never really been much of a mother to any of her children. She stood in the courtroom under a bright spotlight, her wrists bound together in magic-proof handcuffs, staring up at a tall podium in front of the entire council. Also present was Camilla Noceda acting as a bailiff, as well as the rest of Odalia's (former) family, Alador, Edric and Emira. She and Amity glared at each other with a mutually venomous look in their eyes.
As soon as everyone was ready, Lilith, who had been elected Council Chairwoman, rose to begin the proceedings. "This court is now in session!" she declared. "The case of The Boiling Isles vs Odalia Blight will now come to order! Councilwitch Whispers, please read the charges."
Raine stood and unfirled a scroll and read it out loud. "Odalia Blight, you stand accused of conspiracy, enforcing hostile labor conditions, and multiple counts of child and spousal abuse," they stated. "What do you have to say for yourself?"
"Oh, I've got plenty to say to all of you," the spiteful witch began. "Look, I'll admit that I was wrong to trust Belos with all those Abomitons. I should've realized what he was planning to do with them. Although, if my children and their friends didn't oppose me at every turn, I might have been more inclined to believe you when you tried to warn me about him. Really, it's your own fault for allowing me to help him at all."
Naturally, Odalia's words were not helping to sway the council into going easy on her. Nonetheless, she continued to speak. "But now that the Emperor is gone, it leaves room for wealthy and powerful witches like me to take our rightful place as rulers over all others. In fact, since Belos lied about giving me and my family power, I was going to have The Collector do it instead. Once I'd gained enough of his trust, I would've had him find my children and forced them to join me while my idiotic ex-husband remained one of his little playthings."
Alador was angry to hear that, but not surprised. "But since all of you came back and forced The Collector to turn soft, it completely ruined my chances. So thanks a lot for that! As of this moment, I have officially disowned my family! Something I really should've done a long time ago." None of the Blights were fazed by her declaration, as they had already long since disowned her. "I swear that, one day, I will rule the Boiling Isles and make all of you suffer along with everyone else!"
"Oh, and one more thing," Odalia continued. "The Collector told me about how Belos created grimwalkers of all the Golden Guards." Hearing her mention that made Hunter very uncomfortable. Luckily, Willow was able to soothe him by placing her arm around his shoulders. "Maybe I'll take a page from his book and create a newer, better version of my family. One that's a lot more obedient and grateful than the old one."
"Why, you lousy old-!" Edric began shouting, but was held back by his father.
Amity shared her brother's disgust. It took every ounce of willpower she had not lash out herself. Instead, she spoke up in the calmest way she could manage. "You know, Odalia, you really are the most pathetic person I know," she said. "Even in your current position, you still think you're better than everyone else and you're still so desperate to rise above them."
"I AM better than everyone else!" Odalia insisted. "And I will make you regret ever standing against me. You and that bratty human you call a girlfriend."
That last remark filled Amity with rage. Luz could see the anger boiling up on her girlfriend's face and could tell that she was seconds away from lashing out. She gently placed a comforting hand on her shoulder. "Hey. Don't let her get to you," she said softly. Seeing the look on her face allowed Amity to calm herself down.
Odalia grinned smugly at her daughter's hesitance to attack her. "Seems your too weak to really hurt me after all," she taunted. But rather than attack her physically, Amity decided to hit her where it would really hurt.
"You're wrong," Amity said calmly, yet proudly. "I am stronger than you will ever be. You will never succeed in gaining power again because my friends and I will always be here to stop you if you try. You'll have no choice but to watch as those you think are beneath you will be free and powerful while you have no power or freedom whatsoever."
Odalia became enraged by her daughter's words. She tried to think of a clever retort, but couldn't think of anything. So instead, she ran to attack Amity, screaming like a lunatic. But she didn't manage to land a hit because Camila and Lilith both landed a hit on her instead. Camila used her chancla and Lilith used her fist to deck the crazed prisoner in the face knock her right onto the floor. "Stay mad!" said Lilith.
"No one attacks a child on my watch," said Camila. Odalia stood back up and glared at both of them furiously while rubbing her bruised face.
"Odalia Blight, this council hereby sentences you to community service by way of helping in the reconstruction of the Boiling Isles," Darius declared.
"Also, if you ever step out of line, you will be forced to spend an extended period of time with Hooty," Eda added, exchanging humorous smirk with Amity. That part had been the young witchling's idea, after all.
"What?! You can't do this to me!" Odalia screamed as the guards approached her to drag her back to her prison cell. "I swear, I will make all of you pay for this! Do you hear me?! YOU WILL ALL PAY!"
Odalia's vengeful words echoed through the courtroom as the guards carried her away.
Many years later, Odalia did escape from prison along with all of the other villains and attempted a hostile takeover of the Boiling Isles by getting rid of its famous heroes, including her former family. Unfortunately for her, the heroes managed to stop them, just like Amity had said they would.
If you wish to see the amusing image of Odalia putting up with Hooty, there's a fanart of it that I commissioned you can find in my Deviantart gallery.