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Completely understandable. It doesn't look like a broody hen to me. @Miss Lydia may also have an idea as to what is going on.

I am not sure what is going on there. It looks like a spasm of some kind. @Isaac 0 may be able to recognize what is going there and what are possible causes.

You have to uploaded it to YouTube, vimeo or another website and post the link

Can you post a video of her twitching so we can see what is going on?