I have a buff orpington hen (I think) who I think may have a problem getting enough water. The white part of her poop sticks to her feathers, and she throws up a lot after she drinks. She is getting adequate water, though; this has been going on for a while and she seems to be pretty healthy. Her feathers are clean and healthy, her eyes are normal and bright along with any moisture around her nose/beak. She does have some scaly leg mites that I've been trying to get rid of with Vaseline (I need to change out the perches, I think that's where they're coming from). Her breathing seems fine, and she is active. I don't know what this could be; I've read that some hens will just drink too much and it will come back up. Does anyone have any ideas? Thanks!