I think since she's working and taking responsibility for bills etc. then it's o.k. to pay her doctor bills when you know she really is sick.
I actually pay my sons suboxone doctors bill every month for him. He is working full time, his insurance covers the prescription, but not the visit, which is $150.00 a month. He's paying his rent, his cell phone bill, buying his groceries and everything else, so I guess I kind of feel at this point that if that is all he is costing us a month, we are pretty lucky at this point
Bottom line for me is, when he's helping himself, I don't mind helping him.