S.R.
I would continue to give her formula till she's at least one. My son had trouble digesting milk at first, and we kept him drinking smaller amounts of formula until he was about 18 months, although he was into solid food. We introduced milk very slowely. If your ped suspects a food allergy. There are so many good choices for milk subs out there, rice and soy milk are excellent choices. Sometimes kids will react to milk but not cheese and yogurt because the milk proteins are broken down in those products - that was my son's situation.
Oh, almost forgot, check with your ped before giving her freashly cooked eggs or nuts. A lot of times with kids show an early intolarance to milk have other allergies as well. My son is very allergic to all peanuts and tree nuts, and tests positive for eggs on the scratch tests, but he can tolerate them in a cake or cookies.