I can't say for sure but it is sure worth trying along with the Epsom salt soaks the Epsom salt soaks should help heal and then the Banixx along with it. For her to have had this for 7 months and still be with you is amazing so give it a try she has to be a fighter. Is she eating and drinking and pooping normally?
you could also order some Baytril
https://allbirdproducts.com/products/baytril-10 and give her a 5 day course hit this both barrels so to speak.
Hopefully others especially those that have treated something like this before will also reply.  What I like about the Banixx it also keeps the wound moist.
I didn't see that 
@Wyorp Rock and 
@ruthhope had also replied so you have gotten some good info.