Call me an old fashion, but when it comes to parents, I believe we should help them, no matter how bad the relationship is.
Regarding the bills - she's not paying maybe because she... can't?
Does she spend her money on other things?
I think we should't "charge" our parents anyway.
How about if instead of demanding her, you can help her get herself together?
putting the money issue on the side - Maybe it's a great opportunity for you guys to have a better relationship?
Just offering a different approach. Hope it doesn't sound like judging.