It kind of sounds like she may just be having an anal gland issue. She may need them expressed. You should call the vet and make an appt to have it checked out.
I don't know if you checked out the breedlist.com link. If not, there are a few breeders in Virginia which isn't too far, there's also a listing for Arkansas.
Oil and vinegar by themselves are fine, some of the other stuff they add to dressing may be harmful, such as onion or garlic, but if it may have only been a few licks, I wouldn't worry.