Sometimes the female is weak after birth and the male aggravates them really bad. Are there lots of plants(real or artificial) in the tank for fry and females to hide/rest in? If not this might help in the future.
She may have been overstressed with giving birth. Maybe next time if you have a smaller quarantine tank, move her to that tank so she can give birth without the males picking on her. See if that helps. Otherwise lots of hiding places.