What about saying something like, "I understand you don't have the money right now. I can cover and get them the care they need and at the end I will total it up and you can pay me half when you are able?" Just something that doesn't totally let her off the hook and leave you a doormat, but isn't an attack on her 'bubble'. The last thing you want is for her to feel like you are her bubble's enemy.
please don't send that message... that comes across soooo weak... maybe you can ask her how she would like to handle it... "so--how do you suppose we ought to go about taking care of this?" or, "any thoughts on how we might handle the vet bills?" let her ask you for the help... let her offer to pay you back... i'm sure she has funds to spend on her new life with OM... maybe she ought to budget accordingly, instead of expecting you to help fund her WW living...
