I agree with this POST if you have vet care that would be best.There is some bone exposed but I’m not sure how well you can see it in this picture. She has an injury on her back but it’s not nearly as bad.
If not, I would follow the cleaning instructions.
Personally, I would also go ahead and start her on antibiotics. You don't have a location in your profile, so I'm going to assume you are in the US. Sometimes Amoxicillin can be found at stores like Tractor Supply or you will need to order antibiotics. Your vet can give you a better antibiotic like Cephalexin or similar since the bone is exposed.