I was very surprised to see some activity on this case! (updated FBI page, sketch of Amy, and Disappeared episode) I wonder if it's because it's the 20th anniversary of her disappearance, or does the FBI have some new information?
I've followed this case for about 18 years and I feel like I'm just spinning my wheels. If I remember correctly, the Bradleys had Amy legally declared dead in order to bring a lawsuit against Royal Caribbean, which they ultimately did not win.
I don't believe she fell over the balcony rails. I don't see how she could do so accidentally, as those things are about chest high. I don't have any ideas what happened to her, but I think someone got her off that ship. Unfortunately, I do not believe she is still alive at this point.