Lynn,
In this situation I would prioritize to the dairy and gluten first, probably the eggs too. Unless the child is really having oxalate issues that are obvious, i.e. irritability, urinary discomfort (holding their groin), agitation I would focus on the yeast, provide low oxalate support supplements such as Calcium/Magnesium citrate with meals and high dose probiotics such as VSL#3 or ProBio Premium both from New Beginnings. Then recheck the OAT in about 2 months. A lot of the time oxalates are coming from yeast and one or two foods, i.e. almonds, soy products.
I hope this helps.
Dr.Woeller