I would try rice milk too, since you lo is old enough, and eliminate all sources of dairy and soy for a bit to see if it helps. The problem with doing any type of allergy test, scratch test and RAST blood test, is if she is mspi it will not show up on these tests. MSPI does not affect the immune system, like an allergy, and cannot be tested like an allergy. The best way to tell if it is milk and/or soy is to eliminate them from her diet for a few weeks to see if it makes a difference.