So, you are saying the placenta is still inside of her?
Is she stalled now? Does she know she's lost her baby?
If she isn't in the barn - get her there. Feed her Hay and Water only. If she has not passed the placenta and you have oxytocin available (if you don't have any, maybe your goat friends or your vet tech friend does?), give her a 1/4cc to help her get rid of the afterbirth. It would also be good if you have some Banamine to ease the pain of the contractions.
If she knows she's lost the baby, I would advise leaving the foal with her for now so she can grieve....This will also help her stress less, if she is stressing.
In the mean time.......get on the phone and CALL EVERY VET WITHIN AN HOUR RADIUS OF YOU. I CANNOT believe that there is NO VET who will come out after hours. HOLY GAMOLIE!!!!!
If the placenta/afterbirth is hanging from her, do NOT pull on it.