My first guess is a toxin - possibly botulism. I am a duck person, but this sounds similar to what ducks do when poisoned. There is a sticky at the top of the duck forum for flushes. At this point, I would go with the charcoal slurry recipe (please read it, it is for food grade activated charcoal) to try to absorb toxins that may still be in her gut, and keep letting her drink lots of fresh water.
That's my first guess.
That's my first guess.