Would she be willing to go gluten-free as a NCGI patient? It would be a shame for her health to decline... I remember when mine took a nose dive in my early twenties, and it never recovered completely.
Ditto for me...and since my antibodies were all barely positive at dx it is likely I had negative antibodies for years -- my kids all had negative blood work except one with positive DGP-IgG -- although all have had every health issue improve or disappear gluten-free. Two have now been diagnosed based on improved blood nutrient levels along with symptom resolution. Grands were diagnosed based on symptom resolution.
I also have two copies of DQ2 -- if you have two copies of both DQ2 and DQ8 each of your children have at least one copy of each of these genes.