Throwing up chicken

[Chloe+chickens=LOVE]

Hello, my friend got some chickens about 2 months ago. I was at her house last night and we were sitting in the chicken coop and one of her chickens (2 months old) started throwing up after she drank some water. Anyone know what is wrong? Thank you in advance.

 

[Wyorp Rock]

Was this at the end of the day when it was time to start roosting?
Sometimes if a chicken drinks too much water at one time some can come back up.

Have your friend check the chicken's crop first thing in the morning before she eats/drinks to see if it is empty.

 

[Chloe+chickens=LOVE]

Ok thank you. It was at roosting time to.