Shayla was found on Friday evening at about 4:30pm in bushland on the Tasmanian peninsula after responding to calls of volunteers.

Seven-Mile Beach Field Centre ranger in charge Ian Marmion recounted the moment she was located.

"We had a female SES member and a Female parks member who were calling out her name - about every quarter of an hour - and on this particular occasion we heard this call back mummy and we just couldn't believe it," he said.

"We were all instantly elated and joyful and thinking is this really happening, and when she was brought out of the bush and we saw her, yep it's happening, it was great."

Mr Marmion said paramedics attended the scene before taking Shayla to the Royal Hobart Hospital for medical assessment.

He said she appeared in good spirits and chirpy, despite being a little dirty following the ordeal.

SES acting regional major Mark Dance was at the search base when he received the news.

"It overwhelmed us all, it was the news we were hoping for, and when it came over the radio we were all just astounded, it was amazing," he said.

"By all accounts, she was talking, alive and healthy and well."

Mr Dance said even at the end of the third day, searchers were confident they were going to locate the four-year-old.

"We were confident we were going to find her in that area somewhere," he said.

While the search efforts were supported by sniffer dogs, helicopters and drones, Mr Dance said further support was expected as the search progressed, including plains and mounted units.

Mr Marmion said it was a search line of about 50 to 60 people combing through bushland that eventually located the missing girl.

SES southern regions search and rescue team volunteer Ben Arthur was in the line when Shayla was found.

"We were on the right flank of the search spread out over quite a big area and we were searching very thoroughly, the terrain and the scrub was very dense," he said.

"Towards the end of the day at about 3:15 to 4:00 pm we stopped on quite a densely wooded ridgeline and called Shayla's name and much to everyone's surprise, after calling her name for the 100th time we finally got a response from her.

"The call was for Shayla, can you hear me, Shayla, so it was quite clear and quite long and then within half a second of finishing that call, her response was mummy.

"I've never been happier to be confused for someone's mummy."

IN OTHER NEWS:

Late on Friday night, Shayla's mother Bianca Page took to Facebook thanking those who helped find her daughter after she went missing three days ago.

"I just want to thank everyone from the bottom of my heart with everything I have that I am currently sitting here with my precious baby girl with a few bruises, scratches, bites and an urine infection after spending over 48 hours alone in the bush," it read.

"A huge big thank you to the SES, Tasmania Police Victorian officers, ambulance and all the locals of the peninsula, my friends and family and... the whole of Tasmania.

"The messages I received from everybody, your thoughts and prayers were all so overwhelming, I seriously honestly cannot thank you enough."