K.C.
My son also gave up milk around that age (about 15 months) and he never went back (he's now 3 yrs old). Cow's milk is not necessary to a toddler's diet and can aggravate mucus prodution in some people. So it's probably good that your daughter stopped drinking it during her cold. Be sure to offer calcium and vit D from other sources. Don't sweat it and don't feel you need to force it down her...