Her injury looks pretty extensive. Be sure to do the soaks. I would use something like chlorhexidene or betadine in the water for disinfection, and then when dry, use the antibiotic ointment. Hopefully, it will heal, but since it looks a little dark, there could be some necrotic or dead tissue...
Keep the prolapse tissue moist with honey or plain Neosporin or Triple Antibiotic Ointment so that it does not dry out. It may be injured and swollen now, but eventually, it needs to be pushed back inside. Keep her separated with food and water, and away from flies. A 15 minute warm soak at...