What a little trooper she is!
That wound reminds me of when my Siamese cat was attacked by a neighborhood stray and was bitten on her backside, she had something that looked like that about the size of a silver dollar.
Took a long time to heal and she was a caution when it came to keeping it clean for her, but she recovered well. Of course it's a different story for the little animals like rabbits and piggies.
I will keep Daisy in my thoughts and prayers that she'll heal well, and whatever is in her future, there is no doubt that she is so very lucky to have you caring for her.
And my name is Mary.
That'll be a lot easier than Mimzmum.