My cat does the same thing. It could be an intestinal bug or something. We have taken him to the vet about it, but they can never find anything in his stool. He doesn't act abnormal, but when he finishes in the litter box he drips afterwards. You should try taking him to the vet … Read more

I just asked a similar question, my cat has it too, but it is very much like his eye sleepies and he has it pretty much all the time. The person who answered me said it was normal. It is just gunk that gets dry.

She might be having a period, but if it is coming from her butt then she might have something wrong with her intestines.