Is she sleeping?

Short Story: It's been a good life, a long run, and now it's time to
get some serious rest.

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Your cat has hit a mental milestone, where she is actually laying her
burdens down in a sense - she is in transit to a new shade of vim.

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Twitching can be a bodily response to shedding itself of stresses,
tensions, etc.

Stress and tension are not just things we gather from a temporal
situation, but on a much more subtle level; we can gather and carry
stresses for years and years and just become copestetic about it. (I'm
making this up, just stop me if it gets too weird...lol)

I would venture to say there have been some recent changes in her
environment that have caused her to take relaxation to another level. I
also think the twitching will fade.

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Hi Phil,

Is she a siamese? Our siamese developed lots of twitches as she got
older. By the time she was 18 her body was like a Mexican jumping bean
when she relaxed!

I asked the internist vet about it and she said it was nothing to worry
about -- some cats, especially siamese, are just wired differently. I
knew it did not bother our cat. She would be laying there twitching all
over, yawn, then continue to twitch.

If there are signs of distress or pain, you might want to ask your vet.

Rhonda