Try putting water into your pellets and stirring for a bit. They will become like oatmeal, and most chickens attack it. Most wormers such as Valbazen, fenbendazole (safeguard, panacur,) and Wazine recommend 14 day egg withdrawals.
Valbazen 1/2 ml given orally, and repeated in 10 days. If you can't find it locally, you can order it online. If I were you, I would bring her inside for a day or two, and try feeding her by herself. She may be kept away from the food by higher pecking order chickens. I always place a couple of...