Wow, what a "nip" that had to have been!
Poor girl having to go through that, I have my fingers crossed that she recovers quickly and completely. You seem to be taking great care of her, so if it's possible I'm sure you'll make it happen.
About how well is she getting around now in that cast? It looks so uncomfortable, I really hope she doesn't suffer much from it...
But is it bad that a part of me finds the cast kinda aesthetically cute? Sorry!
I think it's wonderful how you're treating her properly and sharing. I personally feel that not feeding together and taking them to a vet like that is good advice for folks. Better safe than sorry in my opinion!
BTW Just a suggestion - You might also want to post this in the vet section with more details (like what kind of injections etc) that way all lizard owners can learn when they're looking up similar injuries.
Good luck! I'm wishing you guys the best~