Traumatised hen - advice please

After the fox attack on Saturday evening, we still have one very traumatised hen.  She has been thoroughly checked over, no wounds, no broken bones however, she won't stand for too long.  She has spent yesterday and today in the chicken hospital - aka the bathroom - in the peace and quiet.  OH gave her water via a syringe yesterday but she is now taking small amounts of water and smaller amounts of food by herself.  She did a poo yesterday which was normal (indicating no internal damage me thinks) and this morning she laid an egg 

Am I just being impatient in thinking she should be better than she is? Or could I be missing something? 

I would reintroduce her as soon as possible but if she is still having problems then bring her back in but this time with a friend. They usually recover better with a friend.

Thanks everyone, we're going to put her back with the others and see how she gets on.