Ehhh, I think if I were her who has been like, gone shit through from her childhood. I mean, At a point I also would be like meh, idc, I just wanna survive. All live for themselves. Say that and go home. Sometimes people Don't want power but are forced to take.
She's in her "prodigy burnout phase". She can end rifts without even going inside them. That's OP af. Of course she's tired of it. She spent how many years being the only S Rank having to take care of everyone? 4? As a child?
Its also partly her brother's fault for supplying her and enabling her.
I think we're supposed to hate her in the beginning, and then she becomes more likeable. That's how character growth works.
She’s annoying it’s not funny, her thinking that she wants to protect her lazy life while doing nothing with her powers is off putting and frustrating. Imagine seeing people dying and she’s like ehm maybe i should go back home to play video games , I don’t care if they die, she’s terrible ( I m still in the first chapters, let’s see if she changes, i needed to vent out)