Walmart does carry de-wormer's. You can get a tube of Zimecterin place a very small pea size amount around bread or roll it in corn meal and see if she will eat it or place gently in the back of her throat. She should swallow it. In 10 days repeat. Wazine only kills round worms but Zimecterin will kill all worms including tape worms. Are you sure she doesn't have a sour crop? Possibly an impacted crop? How long has she been feeling this way? What color is her droppings?