What I do know is that cutaneous vasculitis can get bad really fast. When Dixie had it, I swore she was developing lesions and losing her hair while we were standing there watching her. The prednisone worked quickly to stop it, but she did not improve for some time. If this is that, then it makes sense it is worse because they had her for four days and as far as I understand they gave her nothing. Also, her skin would feel very hot in the areas where there is hair loss.
As for the abdomen...I don't know why you suspect lymphangectasia, but you are correct, to diagnose it a biopsy needs to be done. Has she had protein loss??
I just googled and found this place in your area....there is a Dr. Cook there who lives in Fairbanks and she is board certified. I really, really think you need a consult with a boarded internist ASAP. Of course, they don't come cheaply BUT the consult itself probably would be between $150 - $200 and you might not really need anything done. Just take all records with you if you go there so they have something to look at.
Internal Medicine Specialists at Alaska Emergency Clinic | Anchorage Emergency Veterinarian | Pet Emergency Treatment Inc.