I know there are no words to help in times like this and we really hope your mare is okay.
I might mention that we had a severe dystocia last year and there was a tear involved so the vet did the "Caslick" procedure and the mare is now in wonderful shape.
She has had the "Caslick" in for about 9 months and is due to have it removed end of April.
I am so sorry for your loss, I hate when the year starts out like this, I too lost my first foal of the year...I just pray your mare will recover fully!