K.C.
Cut her fluids to only water or very watered down juice in the middle of the day. This should make her more hungry. Juice can be full of empty calories and milk just fills her up. Toddlers tend to be picky eaters. If she looks and acts healthy then she is getting enough nutrition. My girls would eat for days and then just stop. My 4yo has decided that eating is not very important right now. I keep Pediasure in the house for those weeks when eating is not a priority. Talk to you dr if you are really concerened but she sounds totally normal.