The mother of missing Western Australian four-year-old girl Cleo Smith says the last four days have been "horrendous" as the search for her daughter continues.
Ellie Smith today said she doesn't know what's happened to Cleo and she "wished" she did.
Cleo was last seen at 1.30am on Saturday in a tent she was sleeping in with her parents at the Blowholes campsite in Macleod, north of Carnarvon.
"She was gone, the tent was completely open, it was about 30 centimetres from being open," Ms Smith said.
"I turned around to (stepfather) Jake and I said, 'Cleo's gone.'
"We went looking, checking, making sure she wasn't around the tent then we got in the car driving around everywhere."
While the family has received support, all they want is their daughter home.
"We haven't really slept, we've had so much family help us and support us," Ms Smith said.
"Everyone asks us what we need and really all we need is our little girl home.
"She's beautiful, delicate, she has the biggest heart and she's so funny".
Interstate agencies joined the appeal today, as the hunt for the four-year-old went national.
"The reality is if we do explore the scenario that there is third party involvement and Cleo has been taken from this area by somebody, we are in day four, they could be anywhere," WA Police Inspector Jon Munday said.
Her biological father, who lives in Mandurah, was one of many people questioned by investigators who are determined to leave no stone unturned.
The search for Cleo resumed this afternoon after poor weather conditions put efforts on hold.
Conditions eased this afternoon after a storm struck the Gascoyne region as the search for the missing four-year-old girl stretches into its fourth day.
Yesterday, police called off the marine and sea-based search for Cleo, as fears grow that she was snatched and efforts instead turn to focus on nearby coastal shacks.
Mounted section officers joined helicopters, along with police and ADF drones deployed in the search.
Authorities have been patrolling the highway near the Blowholes campsite in Macleod.
Police hold "grave concerns" for the missing toddler and posted new images of her pyjamas and the sleeping bag that vanished along with her yesterday.
People at the campsite have been questioned, and every car leaving was thoroughly searched.
Inspector Munday said authorities were "throwing everything" at the search.
"We will continue until we can provide some answers into what has happened to Cleo," he said yesterday.
Police are "not ruling anything in or out", but say they are comfortable in assuming she will not be found in the ocean.
"In that marine environment we haven't found any sign of Cleo," Inspector Munday said.
"We're comfortable that they (the police) have done the best they can."
WA Police Commissioner Chris Dawson previously described it as "a very unusual situation where we don't know where Cleo is".
"We're keeping all avenues open," Commissioner Dawson said, adding that specialist police have been called upon, including forensic trained investigators from the homicide and major crimes division.
"We're conducting an extensive search of the area."
Commissioner Dawson added that police are working closely with the family and the immediate community in and around the blowholes and the broader area around Carnarvon.
"Look, it's a very tough environment there.
"We feel very desperately for the family and this very unusual situation where we don't know where Cleo is."
Western Australia Premier Mark McGowan praised the volunteers and emergency services personnel involved in the search.
"Thank you for your efforts on behalf of the Smith family," he said.
"Our thoughts are with Cleo's family during what is undoubtedly an extremely difficult time."
When was Cleo last seen?
Cleo was last seen wearing a pink/purple one-piece sleepsuit with a blue and yellow pattern.
Her mum, Ellie, said the little girl was in their shared tent at 1.30am on Saturday morning.
When the family woke at 6.30am she was gone, with her sleeping bag was also nowhere to be found.
The mum posted an update on Facebook at 1.45am on Sunday, pleading for help to find her daughter.
"If you hear or see anything at all please call the police!" she posted.
Carnarvon Shire president Eddie Smith said on Saturday it was "a terrible feeling" but he implored "everyone to remain positive".
The family are from Carnarvon and often go to the area to camp.
Anyone with information is asked to call police immediately on 131 444. Callers are asked to provide the reference number CAD 781784.