What does a girl mean when you keep complimenting them and they keep saying negative stuff, back?

Everytime I compliment this girl all she does is say negative stuff back, like I told her she was my favorite person and she said “why there’s nothing special about me” or I told her she is so pretty, and she said “ I strongly disagree, any thoughts on why she is acting like this we were doing really good the other day so to me this seems sudden
What does a girl mean when you keep complimenting them and they keep saying negative stuff, back?
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