One of the things that I had to get used to here in Canada was the paranoia about allergies. Peanuts, for instance, once an innocuous snack, are a health hazard. And it seems like every kid has an allergy of some sort - nuts, flour, pollen.
Rama, fortunately, has no allergies. But she feels a little left out. She needs her own! So here's how she figured it out: last summer, she wore flip flops that were a bit too tight, and they irritated her skin between her toes. Hence, she is "allergic to flip flops." She won't wear those.
Another time, she was having a lollipop and the hard candy cut her tongue. She thus concluded, "I'm allergic to lollipops."