Won't drink anything!

STLR

Our 19 month daughter has always been great about drinking milk, and really will not drink any water or juice - although I do mix in water with her milk sometimes just so she's getting some. Yesterday she stopped drinking her milk and hasn't had hardly anything to drink in about 24 hours. She's eating well and I'm giving her lots of fruit and veggies so she's getting some water that way, but I'm worried about her getting dehydrated.

Has this ever happened to anyone? Just wondering/hoping that maybe it's a brief phase. Thanks!