FWIW, a really good way of putting a 'handle' on a chicken, so you can restrain and hold it for cleaning its butt or whatever, is to use an man's sleeveless undershirt. Ideally either use an old one retired to the rag box or do not tell the current owner where his undershirt was before you washed it <vbg>
Lay it flat and use it like a piece of cloth (the advantage of the undershirt is that it is nice and stretchy, but not bulky at all). Just wrap it around the chicken's body like a sling, spread out as wide as possible, from just in front of legs to under the chicken's neck, and hold the ends firmly together over the chicken's back as a 'handle'. It stays pretty well , esp. once the chicken gets wet, as long as you hold it *snugly*.
I hope you can figure out what her problem is and hope she starts feeling better soon,
Pat