Disclaimer: I own nothing that belongs to Supernatural, Doctor Who, Sherlock or Fairy Tail, I'm just a fan and don't want to be sued. This was just a mash up that popped into my head.
It took them a week to get her mind and body fully healed.
It took them a month to get her to stop sleeping on the floor and in an actual bed.
It took them a year to get her to stop crying.
They were at a loss at how to help her. But this was part of their job right; they were meant to be her big brothers? Unsure of how to handle it, they divide her time among themselves. From January to April, Sherlock and John had her. She helped them with their cases, their research and keep their records. She had a gift for these sorts of things, she would find the smaller than small details that would escape even Sherlock's thought process.
From May until August, it was the Doctor's turn to take her. He would take her on his adventures through time and space. He would attempt to protect her but in the end, she would protect him, without a word, thus saving him from his worst enemy, himself. They would have missed their deadline together if not for Sam calling to plan their meet up time and place.
She spent her last four months of the year with Sam, Dean and Cas. She mainly helped with the research and would spend her time binge watching television with Cas, but she was there.
Se was safe.
When they got together to celebrate Christmas, they were discussing their months with her and all believed that she was doing better...until Cas pointed it out.
She hadn't smiled. Not once.
"We can't take her back," the Doctor said, running a hand over his tired eyes. "It's impossible."
"She knows." Cas said, leaning back in his chair. "It haunts her dreams."
It made the angel sad to see her like this. She had always been happy and energetic.
"Dianna knows that she can never go back to Magnolia...and it's killing her slowly."