Starnge sudden behaviour

Question
Hi,
I have two dumbo rats, both female and around 3-4 months in age. One gray one called FooFoo, and a black hooded one called splodge. When i got them, foofoo was alot smaller in size, as i was told she had been ill, but was fine now. They are increadibly friendly, got used to my home very quickly, loved to play climb over me and lick me to pieces! They wrestled a little bit but not really much, and they loved people, always poking there noses out and trying to climb up people.

the problem is that the otehr day, they were both on my bed, not near each other, and suddenly, literally as if someone had clicked thier fingers, foofoo darted under the duvet, and wouldent cme out, the next couple of days she ran from you, did nto want to be touched, wouldent even go in her cage, which is very strange since usually she loved it in there, and also sat at the top of the cage, in a hunched position for almost a day, and when i moved her she had pee'd and just been sitting in it. Now we took her to teh vest, and she said there was no physical thing wrong with her that she could see, and gave me some antiinflamitaries, and antibiotics tio give to her, and also told us she was underweight. Now since then, the medicine hasent really helped. She is a little better, will run around the bed, and occasionally lick me. But wont ever come out in the open, and when shes in her cage she still sits either at the top, or on top of thier house in a hunched position, and today peed herself again. I have no clue what this could be, and the other rat seems to be fine!
Apart from for about two days, splodge would constantly grab foofoo's scruff of her neck and really try and pull her, making her squeak, but after a couple of days foofoo started to wrestle back and pin hwer down and such.
Any help would be great as im really worried about what happened to my loving friendly playfull rat, to make her scared and withdrawn all of a sudden.


Answer
So your saying she is seeking higher ground, such as going to the highest level of her cage or on top of her toys/igloos?  When she lays on the ledge of the cage floor does she happen to hang her head over the sides?  

Is the vet an exotics vet or just a vet that sees exotics as a favor?

Sometimes fear and hiding etc...is part of a panic when they cannot breathe right.  
The vet may have checked her, but if this vet is not a real experienced vet with rats, he may not understand that some types of respiratory problems are subclinical and will not show signs of illness, making it easy to mis diagnose.

Hopefully she was given baytril to be taken for the next 30 days, but she may need a few more drugs, such as albuterol to open her airways if she is  having problems breathing etc..

How is she today?