@hector92
Do you know, I didn't think it was possible to purchase topical antibiotics here in the UK, so that is a new one on me. Thanks
@hector92
I am wondering if this wound is in the top of her wing/shoulder or her actual back. If it is her back, it is right over her lungs and one may have been punctured as they are tucked tight under the ribs in that area. It may also be that the erratic breathing was due to stress.
I would be inclined to thoroughly irrigate the wound with diluted Hibiscrub (Chlorohexidine) or a saline solution by making a warm solution of table salt (or better still sea salt) with boiled and cooled water and putting it in a syringe without needle and squirting it into the wound with a bit of pressure to ensure any dirt and debris and bacteria is blasted out. Then I would blot dry and apply Germolene.... I'm a big fan of the G stuff and have had great results with it on myself and chickens. You will need to keep her separate of the rooster until it heals in case he tries to mate her and puts a claw into it.
The fox will be back so penning them securely or keeping them cooped for at least a week would be wise but longer term a secure run will sadly be necessary. I've had foxes come and nab a chicken whilst I was there, I've given chase and got the chicken back only for them to come and nab another whilst I was tending the injured one. At this time of year, other (wild) food is limited and they will take greater risks because they are hungry and probably pregnant with cubs.