Miko is her name and manipulation is her game.
She was in league of her own when it came to pulling strings, no one was quite on her level-not even that fuck Danzo. She was playing chess with an opponent who didn't know she was-giving her a huge advantage. She was on course to saving the most powerful clan in existence and if that didn't say anything she didn't know what did.
But why?
Why save them? If the massacre did happen she would survive it. Itachi would make sure of that. Why save all these other people?
If your answer was 'Oh, it's because she's a good person!' or 'Because she can!" You'd be wrong. To understand the story you need to understand the character.
Miko is selfish, lazy at her core, callous, jealous, and controlling.
Think about that for a second.
While she is manipulating people for a good cause, she is still toying with people. Willing to put her innocent three year old twin on the front lines. Martyr out her uncles and take advantage of crippled war veterans to set up a power house PR system known as the Art Institute.
And she's jealous. When Sasuke said Itachi's name and Itachi became visibly happy, she wished she was the one who said it first. More recently when Tsume came up with the Cat-Dog festival, she was jealous she didn't think of that idea first.
Laziness was very prominent in her early years. She waited for the attack to happen and even afterwords it took awhile for herself to get in gear. She said so herself 'She should have been listening in-regardless if she understood it or not'.
Miko also constantly wants to be in control. When her uncles were yelling at her house, her first thought was 'I didn't authorized this!' The people she gives power to are all ones she can influence in some way, so no matter what, she stays on top.
But above all?
Miko is selfish. She depended on these people as much as they depended on her. Hinata and Sasuke cling to her and she clings back. Lying to herself, saying she was doing this for Sasuke because she didn't want him to suffer losing his family, but really she just didn't want to lose her family all over again. And she wants to make her life as easy as possible-so seeing as she is a Uchiha helping her clan is the best option.
She was cut off once from everyone she loved and it won't happen again.
But Miko is not a bad person either.
She is passionate, charismatic, caring, clever, and unexpectedly kind.
She recognized something within the Uchiha no one else had even acknowledged before. Art. She was bringing forth a golden age for the clan, stomping down on discrimination and promoting peace with every action.
She recognizes and is humbled she was given a second chance-especially because she was no one in her past life. She is selfish, but only because she has known loss, and clings onto life to save herself, and if that means saving others so be it. She is not afraid of death so much as she is afraid of losing everything again.
She is a lazy person but forces herself to work hard. She includes Sasuke in because she knows he is sensitive and might be overlooked. She provided support for Itachi when he was younger, and gave Naruto his first friends. She saved Hinata from kidnapping and gave the girl self-worth.
When she met Naruto at the park, she didn't recognize him at first-assuming him to be any old kid. So she played with him despite not knowing till the end who he was.
She has all these people at her disposal and endless opportunities for harm-but never takes them. She knows pain and doesn't want that for anyone else.
Except Danzo.
Fuck Danzo.
Overall, Miko is a complex character, which-given her circumstances, is understandable.