This is very alarming. It reminds me very much of "wing-flipping". It's definitely not normal at all...Is she actually pulling any feathers out of the area of her back that her head/beak keeps touching? If she is actually pulling feathers out it's a better situation because it means that her movements are voluntary, but it's still a problem that needs to be addressed by an avian vet immediately. If she's not actually pulling any feathers out of that area, which I suspect she is not, this means that this movement is not voluntary and this is what I think. It does look like an involuntary movement, like "wing-flipping" or "toe-tapping", and these are signs of a very serious problem.
What is her daily diet? And is her cage at all old, rusting, have peeling paint, or does she chew paint off of her cage or anything else? Has she gotten into anything lately or eaten anything lately that could have made her sick?
She definitely needs to see a certified avian vet ASAP, involuntary movements like this are not typically just "dancing". I don't mean to alarm you, but I want to make sure you understand that she needs to see an avian ASAP.
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