Well, with internal laying I don't think anything would come out. The yolk material basically deposits inside the body cavity. I'm really hoping it is just digestive and she has stopped because she feels sick. Reproductive issues are what get most hens in the end (if not predators), but she's...
Direct drench (syringing it straight into her mouth) in addition to the Corid water to drink is to mix 1/2 teaspoon Corid powder with 2 teaspoons water. Give 0.34 ml per pound of weight orally once a day for 1-3 days.