Do you know if she has a micro-chip? It could be that if she does, it is
irritating her. Apparently this has been known to happen.

Could be a lot of things, tic, flea infestation, you need to have a serious
look at it and perhaps even try to take your finger and get some of the
debris up and onto a white paper towel. If  there are brown specs (well even
if not) on the paper towel, wet the area (on towel) and let it sit for a
minute then try to smear it with another piece of paper towel. If it streaks
brown, it's got fleas. This has to be dealt with before nerve damage occurs.
A trip to the vet is probably called for also. Unfortunately, I speak from
experience.

Stone

It's scary when you start making the same noises as your coffee maker.