My hen seems hungry but she isn't able to eat anything. I offered her mealworms before bed last night and she came over to them and was interested but she only touched her beak to them and then shook her head. A small amount of liquid splashes out when she shakes. She seems to have a full crop last night. Today it seems empty but she's doing the same thing. Seems interested but can't eat. She drank water this morning with apple cider vinegar in it. Any idea what is wrong and what to do?