What Makes A Child Vomit After Quenching Thirst?

Granddaughter ate dinner apric. 5pm yesterday - 6;30 normal bowel movement and 15 minutes later threw up a lot of liquid - slight pink tinge. Odorless - no food vomited though she ate throughout the day. Has thirst for water but expels fluid within 20 minutes of drinking. She is 6 yrs- has history of putting non food objects in mouth- recently choked on a quarter (coin) that was lodged in throat. No fever or signs of flu-like vomit (no food expelled at all - no vomit odor). Waiting for pediatrician to call