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You might consider taking a fecal sample to a vet. Let them look at it under a microscope. They can tell you if there are worm oocysts and what type of wormer to purchase. I paid $10 to have a sample looked at earlier this year. They even looked for cocci oocysts.
Or, you can just go ahead and worm her. You can purchase safeguard equine paste or safeguard liquid goat wormer as well as valbazen liquid cattle/sheep wormer at a feed store. If they dont carry them, you can order any of them online from Jefferslivestock.com or call them. The cheapest of these will either be the safeguard equine paste or the safeguard liquid goat wormer..about $10-$15 at a feed store. They usually have a 2-3 year expiration and you can use them to worm your other chickens as well.