We Have A Made That Is Going To Have A

We have a made that is going to have a foal in march or April. This summer we found a wound on her right front leg, we thought it was a snake bite we asked our vet how to treat it and we did as directed . we have been giving her antibiotic shots and her leg is getting worse. We can' t load her in a trailor because she late down and refuses. Our equine vet can't see her until next mid week! Her leg and hoof is swollen twice its size! What can qw do to help her?????