No antibiotics please. Giving antibiotics without an infection leads to resistant strains of bacteria and antibiotics are hard on kidneys. There's no reason to stress your girl any more than she is already.
It sounds as though she's on the road to recovery but she will need to heal before she...
Yes, the others will pick on her because she's weak and wounded; it's sad but that's what chickens do. You would do well to isolate her until she's better. If there's no apparent injury, give her some nutritional support and TLC and let nature heal her. If you can get her into a seperate pen...