I agree that dealing with the mouth problem should be top priority. I'm not sure how blood work would diagnose that. Maybe an X-ray of her head would help. If she is dehydrated, fluids would make her feel better. Just take one thing at a time and try not to be overwhelmed. We all know you have Cassie's best interest at heart. Be her advocate. Don't be afraid to ask questions about why they want to do certain tests. I'd concentrate on the immediate problem of her mouth. The other things may need to be addressed but could probably be done by during a regular vet visit at a more reasonable price. We are all here to give you support.