She obviously isn't in good condition, so this is what I would suggest you do.
Bring her inside, and set her in a spacious, towel-lined dog kennel located in a warm, quiet, stressful free spot in the house. I say towel-lined so you better monitor the color and consistency of her feces. Provided food and water, you can make a soupy mix out of the feed, or add either some electrolytes or Gatorade to her water for a little boost.
We'll want to let her rest for a little bit, then we can do a physical examination on her, to make sure all her legs are working/bending properly, there is no bruising, redness, or sign of Bumblefoot on her pads, etc. Here is a link on how to do a physical examination.
https://www.merckvetmanual.com/exot...ltry/physical-examination-of-backyard-poultry
If you see something take a picture. Stops feeding her treats, no greens, and post a picture of her poop later.
As far as your concern about Botulism. If your fairly certain she has it, two things need to be focused on, providing hydration, and administering some type of antidote/cathartic. With Botulism using activated charcoal would be good, do you have any on hand?
Is she drinking and eating well?