Interesting. I disagree with his answer, saying no it is not an allergy because it would have been more severe. It may not have been enough to cause a huge reaction. She may only have a contact allergy.
After eating the dairy before, how was mood several hours later or her bowel movements?
It is normal for a baby to get a rash from a new food right around there mouth, just from the food sitting there. This happened to a friend of mine and she just kept offering the same food and after about 2/3 days he no longer got the rash, but he got it with every new food as a baby.
If all it was, was a rash around her mouth or so and no other major major symptoms, then I would try again. I would wait about another month or so though. I know here in the US, they don't recommend yogurt until 9 months old and full dairy milk until 12 months.
Why not try with some regular milk based formula and see how she does again.
