Oh that's horrible, if you make a person go through the same thing over and over again hundreds of times of course they're gonna go a bit crazy. Maybe she's escaping from reality by convincing herself this is what she wants. Maybe the first time around she truly was an innocent person who was bullied by the villainess, maybe that's why she doesn't feel bad for doing this to the MC cause she did the same to her, maybe she truly did fall in love with the prince at first...but after all this time she broke and not being able to find an escape from this she just goes through the route that made her happiest or gave her the least pain.
Seeing it this way I can't really hate her, I actually pity her...but what am I doing looking into it so deep? Why does my mind immediately go the tragic route? lol