M.W.
When I weaned our son at 18 months, he pretty much quit drinking "milk" too. (Even bm in a cup!) We would still offer him some at meals but he would choose not to drink. He is now 3 1/2 and drinks milk fine when offered. I'd just keep offering and she will start again when she's ready! Just make sure to offer her WATER throughout the day. We always had a cup ready for the kids so they could drink as much H2o as they wanted!