Pheobe Bishop was last seen near Bundaberg airport in southern Queensland about 8.30am on May 15 after booking a trip to Western Australia.
She has not been seen or heard from since, with CCTV footage indicating she never entered the airport.
Police have expanded the search to "various locations" in Gin Gin and Bundaberg as they investigate what happened to the 17-year-old.
More than a week after Phoebe's disappearance, the uncertainty over her whereabouts is taking its toll on her heartbroken mother Kylie Johnson.
"As another day starts, it's getting harder to breathe and the numbness that we feel at the not knowing is eating at us," Ms Johnson posted on Facebook on Friday.
"We would do anything just to hear your voice, to have you curl up in my lap and hold you tight with your wild crazy hair in my face annoying my nose.
"I have no words to describe what this is doing to our family, to our friends and to our community."
Ms Johnson has been pleading on social media for anyone with information to come forward since her daughter missed her flight and vanished on May 15.
"What we need right now from everyone is to hold your loved ones tight and tell them you love them," she posted on Friday.
Other friends have written on Pheobe's social media, praying that she is safe.
"We all hope you're okay Pheebs, come back," one friend wrote on TikTok.
"I hope you're okay out there bby girl we are all so worried about you," another posted.
Officers have spent the past two days combing through a Gin Gin home, where Pheobe was living, as well as a grey Hyundai ix35.
The vehicle is thought to have been used to take Pheobe to the airport and has been seized by police, who believe it belongs to a resident of the property.
The property's other residents have spoken to officers and are co-operating with police.
"Currently, no one is in custody in relation to this investigation," police said on Friday.
Anyone with dashcam or CCTV footage of the vehicle - Queensland registration 414EW3 - near the airport or in the Gin Gin area on May 15 has been urged to come forward.
Pheobe is about 180cm tall with a pale complexion, long hair that's dyed red, and hazel eyes.
She was last seen carrying luggage, wearing a green tank top and grey sweatpants
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