Yeah I saw the word Fischers so I checked in. I can't offer any species specific advice in this situation. A foot injury could be a big problem when the time comes for her to dig an egg burrow. Thanks for the recommendation though allencg!
Definitely vet time! That's a pretty nasty infection. Some possible tissue necrosis that will need care and the cham probably needs some systemic antibiotics so it doesn't lose toes and/or a foot.