Could she have Cushings, look up symptoms on computer, or be diabetic??? Does her belly look like a pot belly, and her back legs weak??? Not sure for you....I know when I am in a crisis w/my dog and vets are not working out, I get on computer and plugs all the symptoms in and start reading rapidly...The vet did give it sounds like the right meds to start off with, did she recently get vaccination?? Cushings sounds like your symptoms too, I am so sorry for your grief and frustrations, I wish there was better opinions/advice for you...Sometimes animal hospitals see more drastic and the worse of symptoms and have been known to pull off miracles, cause usually they get the worse cases and more familiar...
When in Texas the laws for an expired pet are: you make take your pet if you live out of city limits and bury on property w/sulfur(you have to pour a lot of sulfer into the buriel place and plastic bag the body w/pet whatever keepsakes or blankets you want. Or they can take your pet for a fee and cremate and give you back the ashes for a fee, or they can discard the pet after cremation of their own way...I am sorry for you, I just lost a pet months back and went thru this...I choose to bury my pet.
Call you hospital thats far away and talk with them for advice...a pet will hang on to you and your love until he/she can no longer, they will hold on to your love, sorry to discuss such difficult matter, trying to answer your question... please keep us posted, give your baby a big hug for me!!! This site was very helpful to me when I was in trouble w/my dogs..
Doesn't hurt to ask your vet to do a phone consult with a veterinary internist in your area if you have one. They may offer some ideas about treatments and test. Good Luck!