I just didn't like her. I tried, but all the crap she did in the beginning made her completely unlikeable, even when she helped a kid she basically just told him "if you want to be a thief, make sure you steal from people you can outrun" and then ate some of the food she got from him. And when Bruce first came back, she said she wasn't going to apologize. She just rubbed me the wrong way the entire movie.
Your opinion is your opinion, but I just want to remind you Selina Kyle isn't a hero. She's barely an anti-hero. She's not one to be sorry for her crimes or apologize to the people she screws over to help herself.