At least you recognize your FU. Your best bet is apologizing and getting into therapy/counseling to help support her long term recovery if that’s what you want. My mom is crazy and I’m now no-contact with her. I’ve been with my wife for 10+ years and it took probably 6ish years for me to fully get over the trauma/problems from growing up in a home like mine.

Sounds like she could also use counseling/therapy but I’m not sure recommending that right now is the best bet.

I would also suggest you read Beene Brown’s book, Daring Greatly, and maybe watch her Netflix specials or listen to her podcast (basically whatever your preferred medium is). Don’t try to fix your girlfriend but Brene’s information can help you become more empathetic and understanding on this journey.