Thank you. It's just an opinion based on following too many similar missing persons' investigations on this forum for the past 15 years. There's always a remote possibility that she is alive, but the longer she is missing the smaller that possibility. I don't know what to make of the fitbit information, but if LE are assuming that she is alive because the fitbit is transmitting a heartbeat, I would compare the current heart rate to her heart rate history to determine whether the fitbit is registering her heart beat, or whether someone else is wearing the fitbit. Even if she is alive, whoever has her is going to do everything possible to ensure that she can never tell the story of what happened to her.
Since 2012, I have been waiting for another abduction of a young woman in Iowa. We know that there is at least one person in Iowa who is very good at getting away with abduction and murder, and that person will not stop by choice. I would almost be tempted to look at isolated fishing and hunting spots in a 20 mile radius of Brooklyn for a body.