I have a 2 week old chick that we have had for 3 days. She is alert and active, but she is having some trouble. She regularly has very watery poo. Like almost all water. She also had watery type stuff come out of her beak--like she threw up! I thought chickens don't throw up? Also, it is late in the afternoon and she has had access to food all day, yet her crop is empty. She does not seem to be in any obvious distress, but something is wrong. Ideas? Treatment? Her 3 sisters all have nice full healthy crops and normal poop. They have been together since birth. Do I need to isolate her? Thanks for any input.