I do not think Corid would work. Corid is an anti coccidiostat, for coccidiosis, a parasite, not an antibiotic. My concern is that it's infection from the injuries. Externally I cannot see anything in the pictures that looks concerning, but I don't know what is going on inside, if there is infection there somewhere. Amoxicillin is getting harder to find, but still can be gotten as fish antibiotics, fish mox or aqua mox, online. If you have a vet that will prescribe that would be faster. It's usually very well tolerated, and that is what I would give if she were mine.