I just watched this case on Disappeared, and I have to say I'm very on the fence about this onebut I think I lean more towards her never having left the ship alive, and possibly falling overboard, due to others saying she had been feeling sick from partying a little hard that night.
Now she might've left the cabin to meet up with Alister Douglas ("Yellow"), the band member that had been flirting with her earlier that evening. That would coincide with a sighting of them together around the time she went missing, and a later sighting of Yellow returning alone. If this happened, then maybe there was an accident, and she fell overboard either because she was still drunk and/or sick, and Yellow just covered it up in order not to be involved. That would explain why he so quickly offered condolences to Brad, as well as his admittedly distasteful "thumbs-up" after being questioned. It might also explain why Amy's father woke up so suddenly. Maybe, in the state between sleep and wakefulness, he unconsciously heard the sound of his daughter falling.
A note about Yellow's comment, though. I know that in the context of what ended up being a 20-year missing person's case, it's so tempting to take "Sorry to hear about your sister" as an admission of guilt and/or involvement. I can hear that too. But is it possible that, given the fact that Amy had partied hard and might be feeling sick, the comment might mean something more like, "Sorry to hear your sister's had a rough night," especially since he too would've heard Amy being paged about an hour prior?
The sightings on Curaçao afterwards could be erroneous. Heck, even the sighting on board the ship could be mistaken. All of us on WS have encountered this before. I remember the case where a young girl went missing, and was thought to later be present in a New Kids on the Block video two years laterand later, the family learned the young girl had sadly been killed shortly after being kidnapped. Tattoos can be misremembered, names misheard, timelines mixed up, all out of a genuine desire of people who do want to help, and wish for answers and closure.
I'm sure that in three other threads on this case, many timelines have been made. But for the convenience of this thread, here's what I can piece together from various cited sources.
Tuesday, March 24, 1998
1:00am: The parents go to bed.
3:40am4:00am: Brad, Amy's brother, returns to the cabin. Amy returns a few minutes afterwards.
5:15am5:30am: Amy is sighted asleep on the deck by the father.
5:30am: (Astronomical) Twilight begins in Curaçao.
5:30am6:00am: Crystal Roberts says she sights Amy going up to the next deck with the band member.
6:00am: The father wakes up, and Amy is no longer there.
6:37am: Sunrise in Curaçao.
7:00am: The mother is wakened and told Amy is missing.
7:00am-8:00am?: The Rhapsody docks and passengers are formally allowed to disembark.
7:50am: The first page to Amy is broadcast on the ship. ("By then... most of the passengers had disembarked...")
9:00am: The band member tells Brad, "Sorry to hear about your sister."
12:00pm ("lunchtime"): The captain tells the family that Amy is not on board the ship.
(Sources:
https://www.drphil.com/slideshows/the-search-for-natalee-amy-bradley/ Page 2
http://unsolvedmysteries.wikia.com/wiki/Amy_Bradley
https://unsolved.com/gallery/amy-bradley/
https://www.timeanddate.com/sun/curacao/willemstad?month=3&year=1998 )