Here's some of the things she does.
Pins eyes as small as they go
Lifts her wings a little bit
Moves her head around very slowly (it's almost mesmerizing to watch, Very scary looking too haha)
Extends her neck as far as she can, Then slowly brings it down towards her feet
It also seems like she is trying to make her self as tall as she can and she makes her feet extend to make her taller
I only see this behavior randomly as it is hard to initiate, But sometimes if i get off my chair or sit down on my chair, the sudden movements seem to trigger it. It doesn't seem aggressive at all either and she also appears to snap into and out of it very quickly, often returning to do what ever she was doing previously moments later.
I am in the process of trying to get a recording of it, Other than that my bird is fine, Very Healthy, Active and Vocal at times

Thanks, Tom.