Aw I’m so sorry about her foot.
How is she acting? Is she eating and drinking okay? She might just be in danger of losing digits or the foot itself. Do you have access to vet care if she seems lethargic?
Many chickens go on to lead somewhat normal lives with only missing toes and even a missing foot. Some may need extra help or things such as low roosts or a comfy nest on the floor and a vigilant owner to make sure they’re not getting pecked on. Im not experienced in limbs amputating themselves, but I feel like I see some tissue there that could be alive and okay still and she wouldn’t be dropping a whole foot. I hope someone with more experience can chime in. Keep treating it as best as you can and time will tell what is salvageable. It will look worse before it is better, I’m sure.
In the event that she were to lose a whole foot, do you have time to dedicate to a handicapped chicken? I think that’s something to consider if you were to think about euthanization.