J.J.
I would NOT give her cow's milk. I would try a different formula. I would try Alimentin (spelling?). It's expensive, but it's pre-digested cow's milk. It's possible your baby has a dairy sensitivity, not an allergy. She will likely outgrow this though.
I don't use baby food. I use the food processor and just give my baby what we are eating, unless it's spicy.