hollys got a sore bum

help! i no i worry too much but holly wont let me touch her tail or around that area. she was desexed 2monthsago but i dnt no wats wrong!

If your cat is that ouchy than a vet visit would be a good idea- without knowing the history- is the cat an inside only cat? inside/outside, do you have other cats? other pets? anyone living in the house that might have hurt her? It is hard to tell why she is so sore. Again, a vet is a wise idea- even if you just call and ask their opinion before setting up an appointment-