Well, the preliminary results of the biopsy came back, indicating a mites/allergic reaction. The vet did not see any signs of mites nor did I, but she was treated for mites last Saturday just to rule that out. I can't imagine what she could have an allergic reaction to. I use newspaper to line her cage and use the same bedding in her litter box that I've always used, and her food bowel, water bottle and wheel are all plastic.
When this whole thing started I switched from newspaper to plain white computer paper, and instead of bedding in her litter box I used shredded white computer paper. So I can't imagine what she had any allergic reaction to, and if it ever was mites they should be taken care of.
Anyway, she leaves the wound alone as long as she's on the pain meds. So we'll just keep her on those long-term unless that stops working.