Wish I had more advice to offer you. It sounds like you're doing everything possible for Lucy. The only thing I can think of is to up the temps a bit (up to 88-90) between now and the vet visit. It's not a cure all, but may help her if she's fighting an infection. Then again, if she's dehydrated it's not so good, so use your best judgment. Good luck and please let us know how the vet visit goes...