Tibbetts' parents are adamant that their daughter is still alive, and have started raising money to fund a reward for her safe return home.
She was up late doing homework on her computer the night she vanished, according to family members.
"Sometimes I just feel her sitting on my shoulder", she said.
In just one day, the "Bring Mollie Tibbetts Home Safe Reward Fund" raised $172,000 (AUD $233,500) Tibbetts' mother, Laura Calderwood, revealed at a press conference on Thursday.
Mollie Tibbetts' Father, Boyfriend Plead for Public's Help After Unconfirmed Sighting.
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"Do the right thing and, you know, let her go", he added.
Crime Stoppers of Central Iowa spokesman Greg Willey promised to protect the anonymity of tipsters who call in or submit tips online, saying the group uses software that scrubs identifying information.
Investigators have said previously that they were confident on Tibbetts' digital footprint, but they did not release any information as to where that was.
Tibbetts hasn't been seen since July 18, when she went for a run in her small hometown of Brooklyn, Iowa.
Calderwood said she feels her daughter's presence every day.
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Tibbetts, a 20-year-old University of Iowa student, hasn't been seen since going for an evening jog on July 18 in Brooklyn, a community of about 1,400 people where she was living.
But he also believes the case will be solved by someone who comes forward with new information.
Rahn declined to say at the time whether investigators have found her FitBit or if they know its location.
The Iowa Department of Public Safety said that her last known article of clothing is believed to be dark-colored running shorts, and a pink sports top and running shoes, color unknown. "We are very hopeful with the electronic data we are getting back", Mitch Mortvedt, assistant director of the Iowa Division of Criminal Investigation, previously told the Des Moines Register.
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