Sorry to hear that Mittens has an infection in that fold but it's great you did see a vet and are getting it treated. She isn't going to much like the treatments but it's for her own good so just keep at it. I'd suggest you might want to have her on layers of plain white papertowel rather than loose bedding until that area is completely clean, healed and closed fully. I like the Viva brand myself. Plain white papertowels, not expensive and they are soft as cloth.