Thanks for the pointer to Amarillo. I wouldn't have thought of that. I've heard of Gumball head, but I'll certainly have to get some now for her to try.
The benchmark commercial offerings are Bells Oberon, Hoegarden, and Goose Island Urban Wheat. Hefes have not been as popular. Recently she's tried a few white IPAs (e.g., New Belgium Accumulation), but she finds them too hoppy.