'She was taken': Parents' new plea as Cleo search continues

The mum of missing Western Australia girl Cleo is holding out hope her little daughter will be found alive.

With abduction now a primary focus for police, the massive search for Cleo, four, has widened from the tiny coastal campsite in Carnarvon to a much broader zone of remote WA.

"We have hope that our girl is (out) there, somewhere," Ellie Smith said.

"She was taken," Ms Smith said, sitting next to her partner Jake Gliddon, when asked what she believed had happened to Cleo.

"How did someone come into that tent and take Cleo? How could someone take a child?" she asked, with tears in her eyes.

"My gut just felt sick."

So far there have been few clues, at least made public, surrounding the mysterious disappearance of Cleo.

Cleo was staying inside a tent at the Blowholes Campsite with her mum, Mr Gliddon and baby sister Isla.

Ellie Smith and Jake Gliddon have pleaded for anyone who knows something to contact police.

A tent door zip was reported to be at least partly open, beyond the reach of little Cleo, and her sleeping bag was also missing from inside the family tent.

The question police are desperately trying to answer, with crucial time fast ticking away, is who took Cleo?

Police have called for CCTV footage from businesses and homes from a massive 1000-kilometre radius out from Blowholes Campsite, as they try to track a potential abductor who could have whisked Cleo away in a vehicle.

They are currently to locate a car witnesses said drove away from the campsite in the early morning hours when Cleo was reported missing, on October 16.

Ms Smith said she last saw Ellie in the tent at 1.30am when the girl woke for a drink, but she was gone at 6am.

She has not been seen since.

Pictured are the pyjamas cleo was wearing the night of her disappearance and a similar sleeping bag.

The Blowholes camp ground is very isolated, situated just behind a beach and surrounded by sand dunes and a lighthouse.

Land and air searches of the coastline turned up nothing, and the search around Blowholes has been suspended.

Police have asked farmers and locals to check sheds and any unused shelters on their properties for clues.

"She could be anywhere," 9News reporter Mia Egerton told Today.

"It is very difficult terrain to search," adding that "a four-year-old just can't vanish into thin air."

Egerton said the Smith family is well-known in the Carnarvon community.

"You can't walk through town without seeing Cleo's face on every single shopfront," she said.

"There are bumper stickers on the back of every single car with her little face on them."

The area around Blowholes is stark, largely made up of scrubland. Police horses have been used on the ground, with experienced stock musterers also joining in to help. Helicopter pilot Justin Borg said he expected to find young Cleo in just hours on day one.

Locals have gathered for candlelight vigils and undertaken a number of independent searches, including experienced stock musterers.

One local chopper company flew multiple sorties up and down the coast and inland, looking in vain for Cleo.

The Carnarvon community has raised $74,000 to support the family.

An abduction remains the "main line of inquiry" for police, but Egerton said detectives are ruling nothing out.

Police still have no suspects.

Meanwhile, the Blowholes campsite is open for business, with a small number of travellers staying at the WA tourist spot.

Egerton said there was now an "eerie" feel to the place.