My chicken stopped walking!
Welcome to BYC. With greenish droppings she may not be eating enough. You may want to put her in side a rate or cage, and either bring her inside or leave her in the coop with food and water. Vitamins with electrolytes in her water would be good for her, and offer her some chopped egg, tuna, or liver for some extra protein. If you have a local vet who would examine a few of her fresh droppings for worms, coccidia, and bacteria or fungus, that would be good. Silkies can be kept from their food and water by more aggressive chicken, but she also may be sick.Did she have any vaccinations for Mareks or other things?