Has anyone ever gotten an allergic reaction to apple juice?

My nine year-old daughter had a very bad allergic reaction last summer. By the time we made it to the hospital, she was completely covered in hives and her arms were beginning to swell. She swore it was the Apple juice she had just drank, but I didn't see how that could be possible. However, last night at my father's, he gave her Apple juice without thinking, and the same reaction happened again. This whole thing doesn't make sense to me. The juice she was drinking was organic, and unless the packaging information is false, is supposedly 100% Apple juice. Anyway, we are waiting for an appointment to a specialist, and hoping to get to the bottom of this...