It might be a broken foot open or compound fracture. I would clean it with Betadine, Hibiclens, or what disinfectant you have. Apply plain Neosporin. Isolate in a dog crate with food and water. You can try splinting it in a natural position with padding, something stiff, and vet wrap, but check circulation often. She may limit use of i nit need a splint, and you can still clean it with Betadine twice a day.