Still not winning. The straw is sitting in the exit to her crop and won't budge either way. I can feel enough to feel where it is now but I can't seem to manipulate it out of the way. She's losing weight and although some has emptied overnight, not much.
Epsom salts laxative today and that's the last ditch effort - if that doesn't shift it I'll have to call it a day before she really goes downhill.

I'm sorry she is not doing better.
I have never done it, but some people have had success by performing crop surgery. A vet is always best, but it may be something to look into. There are quite a few videos on youtube and threads here on BYC about surgery. The Chicken Chick also mentions it in her article http://www.the-chicken-chick.com/chicken-anatomy-crop-impacted-crop-sour/
@rebrascora I believe may have some information as well.