Quiche sounds good.
Betty Crocker does have some gf mixes, that, since she doesn't have additional allergies might work. For example, gf Bisquick...which has better ingredients than the reg. variety!
I can't vouch for these, but:
GF pie crust using Betty Crocker gf rice flour mix. You need xanthan gum, though...
This is a gf pie crust mix with cream cheese in it, which might help the texture. Vinegar, which is a dough conditioner, works very well with gf pie crusts.
A Different Pie Crust
GF pizza crust with gf Bisquick
I hope that this helps!
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