Has she been exposed to fungi that may have caused the botulism? I know that it's hard to tell what they've been eating but generally animals avoid eating things that aren't good for them.
There have been a few cases, including one of my hens, of a Vitamin D deficiency that can cause similar symptoms of botulism. In my case, my hen was staggering, walking sideways and crouching continually. On a recommendation from a BYC member, I broke open a capsule of Vit. D and E and put a couple of drops in their food, which had been wet down to porridge consistency, and mixed it well. Within a couple of days she was a little better and all symptoms were gone within a week. I now do this for them once a week because we've been really cloudy this winter.
You might also put vitamins and electrolytes into their water.
Good luck, Mary