When women say "more than I should" it's a way of saying "I really like you but I've been hurt several times in the past and I'm too afraid that I'll end up hurt once more." It doesn't mean that she doesn't want to like you, but she is trying to be cautious about how deep she falls because she's afraid of getting hurt. So if you truly care about her "a lot" then make sure to acknowledge her fear and tell her that you don't want to hurt her but that you won't jump into something serious too soon if she isn't ready. Hope I helped!
"More than she should" means she really likes you, a lot but is afraid you will hurt her. So she is trying to keep her emotions in check and not fall too deep. She's probably been hurt before and is wary that this situation will be any different.
If you do truly like her and want to be with her, show her that you can be trusted. Appreciate her and treat her right.
Right now isn't a time for her to have a relationship or she scared she will get hurt again. She foeant want to be the person who likes the other person more is what she is saying. She is scared is all. You need to persue her but make her feel comfortable ans feel like she isn't gonna get hurt
Bf or a real distaste for something you do (things like drugs/drinking/smoking/ your a friends crush or ex or you're her best friend and she doesn't want to jeopardize that) could be the only reasons I can think of that she would say " more than she should". Or she could just be emphasizing a point that she really likes you. Hard to be certain.