AITAH for setting boundaries with my mom

I’ll keep this as short as possible, but long story short I never had the best relationship with my mom growing up. As I’ve gotten older I’ve learned to forgive a lot of the trauma she put me through and have tried to build some what of a relationship over time with her . My mom unfortunately is just a very negative person and I think she feels entitled to me taking care of her in her old age even though she wasn’t there for me as a child and chose drinking and her pedo bf that offered me money for sex when I was 16 and told me I was lying lol anyways yeah she basically has no income right now , has no way of filing for disability due to her weight and various health issues and I told her I would happily pay for her flight to come visit me for a week, but I would not be able to fund the entire trip. She left me on red and I felt her energy over FaceTime was very salty and very negative. So AITAH for setting these boundaries? I want to have some kind of good relationship with her but tbh I don’t know if it’s possible just given the kind of person she is . She’s lost a lot of her own friends and support group as well due to her behavior and mental health issues but I need to protect my own peace .