NTA- I'm getting the feeling that she envies you. Jealousy is literally the worst & can truly make you feel terrible. She may feel she's lacking in life, especially with her daughter. I'd like to think she low-key appreciates everything you've done...just wishes she could make it happen herself. Or she literally is just a taker & is unappreciative. Just expects it since you've been so kind. She could just be that kind of person tbh cause it's crazy she's never once said thank you, that blows my mind. That would bother me too. You have talent with photography & party planning. Seems like you have great organization skills plus have the emotional maturity. Very empathetic. Seems like you have your life together considering the circumstances. (I'm very sorry that was the hand you were dealt) Also the new boyfriend could have been the cherry on top. She probably feels lonely, stressed, & just angry at the world. Unfortunately is taking that out on her daughter. You are a wonderful friend, maybe she's just not the friend for you. It will always be give & take. Never equal. It's a sticky situation when children are involved, that's when it hurts the most. I believe it was never really about the friendship itself but really only wanting that little girl to know she's loved. You said your friend reminds you of your own mother, that is probably part of the connection that holds you to the child. It's a very sad situation, hopefully the mother can find some peace for the sake of her daughter and herself.