Probably. It's likely her way of processing and forming/honing her own value system. She's not outright laying insult on her mother it sounds like, which is a good thing, but she is forming opinions of what is and is not OK with her, and using her mother's preferences and actions as the basis for what she will not do or be.
I think it's pretty normal. I went through the same phase with my mother. She had some angry and bitter years I never liked, so I dedicated myself to never living or thinking like her. She got over that phase eventually, and my opinion of her has changed since.
"If you deliberately plan on being less than you are capable of being, then I warn you that you'll be unhappy for the rest of your life."
~ Abraham Maslow