Sounds like the poops may be irritating her tushie. I'd keep putting the AD on it. Ask the vet if there is something you can give her to soften her poops.

I'm stumped, Melissa. Let us know how you make out.

When I adopted Little Miss Crabby @$$, she had Ghiardia and then Coccydia. The vet told us that she needed to be isolated from the other cats till the third test came back negative.