Is she eating and drinking? If she seems to be suffering, it might be time to consider putting her down. I believe in trying to help and give them a chance to recover, but she may have internal damage or paralysis. So sorry.
Yes, I would not give a bath or soak. Chicken slings can be good for hours throughout the day, but she should have breaks to rest stretch and to sleep at night. The feet can touch the ground, but if she tries to get out, she can get out much easier with her feet touching the ground. Just use...
Welcome to BYC. Is she able to sit upright? A chicken sling chair might be something that you would want to make for her, to get her upright and in front of a little cup of food and water. This link has examples of sling chairs, and I especially like post 12 and 31...
Sorry about your friend’s pullet. I hope that she survives. Hawks are a fact of life in the country. They are not as dangerous to grown chickens, but young ones are so vulnerable. Hawks can pound them when they attack, and cause internal injuries besides the talon injuries.