M.C.
does she drink from a bottle?? This is going to be an unpopular post, but I know that both of my girls would chug their whole bottle, but when I switched from bottle to cup, they would just sip. I kept them drinking their milk or formula from a bottle until after they were 2 years old. (their teeth are fine, btw) Give her milk between meals. My kids eat at least 4 meals a day, also. We eat breakfast, then my 3y.o. eats a snack midmorning, then lunch, then after school, they both eat a sizeable snack (a quesadilla, or grilled cheese sandwich and fruit or something similar) and then we eat dinner. so that is two more meals than I eat. And my 3 year old drinks 2 or 3 10-oz cups of milk in between. They are pretty skinny children, 50% or less and I always have to take in their pants to keep them from falling off. So maybe try to feed her 4 meals a day and offer her milk/formula 3 times a day. Good luck.