It was actually saying her card was invalid or something. I jsut thought it was that my # was linked to the reservations.
Maybe we'll have to see if something's wrong with her card. Her number seems to be fine when making reservations.
I tried to make a couple of seperate reservations online this morning, but it always has 1 adult as a default; I couldn't just buy one child ticket online. Don't know if it's possible in person or by phone either; another curiousity.