Good idea to have the vet check it out. When my cats had worms I was not able to see them at all. After grooming, eh?? (sorry, I'm Canadian, eh??) Sounds like she may be a bit irritated. Usually if cats groom their "privates" alot it could be a sign of UTI (Urinary Tract Infection) but you would know it if she spends alot of time in the litter box. I would start with the stool sample and take it from there. Hopefully you will get some more responses from other PT'ers as well.