Seems like you have done all you can and it will just take time and extra love for the girls - and it looks like you are giving them plenty of that! Best wishes for you all.
Is there any chance that the predator is coming back at night and they can see or hear it? If so, is there any way to protect them from the sights/sounds - maybe some extra boards in strategic locations? Just some thoughts.
They have all had some traumatic days of late - encourage them to come out and eat and drink, offer them bribes, and give them time. Can you put any food or water in where they are staying? Definitely give them vitamins and extra nourishment for the next week or two. With all of that and a...