I don't know if this will help or not - but I have a silkie in a similar situation (only she won't eat or drink), and I've been working through her symptoms trying to figure out what is going on. I suspect it is wry neck. Anyhow, in case it helps you - my bird was attacked by a cat (I think), and had a small puncture wound in her neck. The wound is healing nicely, at least what I can see, but she is acting super strange. Almost like she had a concussion, which perhaps she did. Her head wobbles around, and initially she wouldn't stand up, or fell forward and kind of face planted into the bedding. The good news is that she seems to be getting steadily better. She stands and turns around, and even flapped her wings when startled. I pick her up, and her little legs strain like they want to walk. This morning I even heard a cluck. She is suddenly obsessed with preening herself, and dust bathing in her bedding. But her movements still seem altered, and less smooth. And she won't eat or drink. While her wound is healing well, I suspect/hope (given alternatives) there may be swelling inside, or nerve damage, either of which is causing balance issues, and, unfortunately, making her fast. If so, maybe time will heal them. But increasingly I suspect that it could be is wry neck. When she was attacked she could have twisted her neck somehow, which is now creating problems separate from the actual wound.
I relate all this because it sounds like you might be in a similar situation. Even if the hawk didn't cause a puncture, it may have twisted your birds neck funny? (A vicious peck to the head can be enough, allegedly, to cause wry neck in small birds, and I read bantams like silkies are particularly susceptible). If it is wry neck, I've read that vitamin drops (such as poly-vi-sol) can help. There are other remedies as well. (More info here:
http://oureggbasket.blogspot.com/2013/04/wry-neck-or-crook-neck-understanding-it.html). I'm trying to give my bird vitamin drops, but it is a little tedious, as she won't willingly take them. I hesitate to try anything more invasive (like tubing) or forceful as a) I'm not a vet, b) I don't want to get liquid in her lungs and c) if something is wrong with her neck, I don't want to make it worse. If your bird shows interest in food, I'd say it's doing better than mine! Perhaps the vitamin treatment will work.
Who knows if our birds have anything in common. And hey, maybe these are all just symptoms of shock wearing off. But the symptoms do seem similar, and I suspect mine have something to do with nerve or muscle damage affecting balance and/or wry neck. Let me know if you have any success. Good luck.
