I'm sorry I'm just now seeing this, and praying for a positive update! I can't believe he was suggesting putting her down
3 detached placentas? How long was she in labor before babies came? Usually the placentas start detaching 4 hours after labor begins. A long labor without babies could have ruptured her Uterus. Did the Vet check her for ruptured Uterus?
I'm really sorry you're having to go through this!