Oh DEAR!! I know someone here who had a filly born at that same age, and was given really no chance to make it. The cartilage in her legs was not developed enough yet, along with all the other problems of a preemie. The filly DID make it with the great care she got and is four now and being broke to drive!! If you need the gals info and want to contact her for possible info and help, PM me- I am sure she would be glad to help with info.
Praying for little Abbie!! Keep us posted- so sorry to hear things aren't better!!