Mollie would have to grant someone explicit permission (essentially "friending" them on the fitbit app/website) for anyone besides Mollie to view her runs/workout history/weight etc. Fitbit should have a record of anyone Mollie granted such permissions to.
2 Notes from this article:
1. "Authorities have NOT found her Fitbit or cellphone."
2. "The reward fund offered for the
safe return of a missing University of Iowa student has grown to more than $332,000."
That language suggests Mollie has to return, Sharon Papini style, alive and well to get the reward. Is there a separate reward for turning in someone who is ultimately held responsible for MT's disappearance, in the worst case scenario she's not alive and well?
My guess is most people will assume the reward is for any info about Mollie's disappearance; which could be a helpful lack of understanding by the general public.
Mollie Tibbetts reward fund reaches $332,000