I'm so glad to see that y'all are talking about botulism. I just got into this thread, catching up (probably missed something) but to me it seems quite like botulism or mycotoxicosis. More like botulism. However the test is this: pull some feathers. IF they pull out easily, it's for sure botulism. If she seems to be losing feathers in the cage, too.
Otherwise, to me it looks like a toxin which still can help witht he molasses flush. Molasses WILL dehydrate her so she must have electrolytes after the flush. Same with epsoms. Both are flushes, designed to flush toxins (and anything else) out of the system. So replace it with full-strength poultry electrolytes in the water as labeled. Also on the yogurt, give to her as a quickly eaten wet mash - don't let it sit more than 15 minutes.
All her food right now needs to be crumbles - nothing solid. her system is going to be essentially shutting down to more complicated feeds so use crumbles. Moisten them if she'll eat them that way.
Could she have gotten into any of the following:
spoiled or wet feed/water
mud puddles or standing water or a pond
decaying vegetation including lawn clippings in water
kitchen scraps
compost pile
any toxin run off - (toxins used, lawn watered, water drunk)
canned goods
soured grains
under pens where manure is
maggots (even near flower pots)
anything at all decaying
mildew, fungus of any kind?
Saying a prayer right now for her. This is just heartbreaking.
These articles helped me save my ducks from botulism at this stage:
Botulism flushes:
http://msucares.com/poultry/diseases/solutions.html
Botulism:
http://msucares.com/poultry/diseases/disbact.htm