It's too bad more people didn't chime in to help you Wish I had more to offer, but without seeing the poor girl in person I just don't know what to add. Could you get a video of her and try to zoom in to the wound? I wonder if she was grabbed by a snake...

I would keep her in very sanitary conditions (looks like you've got her on damp paper towels which is good). Wondering if Melafix could be used on her wound... Is she eating at all? I would give her only the most digestible food, no mealworms; crickets with the hind legs removed possibly.

Good luck with her, keep us updated!