It should be pointed out that the young girl could receive the Precious Blood and that she would be receiving the whole Christ...but these issues usually involve someone trying to make a point rather than any real search for the truth.
FromGirl's First Communion invalidated over wheat-free wafer - billingsgazette.com:
"A Monmouth County, N.J., woman is battling the Catholic Church after church officials invalidated her 8-year-old's First Communion because she received a wheat-free wafer, contrary to church tradition.
Liz Pelly-Waldman's daughter, Haley, suffers from a rare digestive disorder and can't consume the wheat wafer that Catholics believe becomes the body of Christ during Communion.
Pelly-Waldman initially asked her priest to allow Haley to eat bread made without gluten, which is a component of wheat.
But the priest refused. And when Pelly-Waldman found a priest who would serve Haley a gluten-free wafer, the Diocese of Trenton, N.J., stepped in and declared that the Communion was invalid. "