You could give aspirin, and a vet could prescribe meloxicam for pain and inflammation. Aspirin dosage for a silkie is 1/4 to 1/2 tablet of 81 mg low dose given orally twice a day for up to 3 days. Making some wet mash with her feed and water in a small bowl daily, could get some water into her. If she will eat scrambled egg or tuna, just sprinkle with more water. Hold a small cup of water up to her beak. If you notice in some pictures of the chicken slings, some have placed food and water into small containers and attached them in front of the chickens.