So sorry about the hawk attack!

It is horrible to come out to a murdered chicken! It's pretty horrible for the chickens too. We had an eagle attack in July. One chicken was killed outright, one was injured and succumbed to her injury a week later and one died of shock a few days after the attack. It was simply devastating for me and my chickens. After a bunch of shuffling in the pecking order, and very few eggs, things were getting back to normal. That was a couple weeks ago. Then another hen died of unknown causes on 8/15 and we started the whole thing all over again. And now they are beginning to molt.
I'm just sayin'...I can empathize.

Don't worry though. They will work it out and get back to normal. It takes time.