Once you clean it all up, using honey or a triple antibiotic ointment, plain neosporin, or even vaseline on the injured part will help keep it moist which will help healing, it will also help keep droppings from sticking so it's easier to clean her up. I would reapply the ointment often so that...
It may heal up and be fine. Time will tell. If it's scar tissue then it may reduce with the passage of time. You will have to watch her if she lays, to make sure she doesn't have any issues with that, and hopefully no other damage that isn't visible. If droppings are an issue then you can...