Help why she like this

Hi everyone can someone help me please why is my chicken standing like this she has been like this for the last week she doesn't seem to be in pain she is eating and drinking like normal but I have separated her due to the other hens picking on her. She does full down sometimes but not all the time please help I don't won't to lose my baby thank you p.s she stopped laying about a year ago so it's not egg bound video link is up the top thank you for in...

Help why she like this