Her husband Kailash Mansowar, who has not heard from her since, has travelled to the region from Sydney to find her, guided only by her iPhone's last location.
"I am here in Nepal now (since) yesterday and working with local authorities to find further information," he told AAP on Friday.
He is one of several Australians to make the desperate trip since an ice avalanche triggered Nepal's worst natural disaster in more than a decade.
At least 469 people have died since Wednesday, Nepalese authorities said, while at least 1300 remain missing including 39 Australians.
Like many missing Australians, Ms Adhikari was undertaking a group tour, in her case with the Isha Foundation.
She left Kathmandu on August 14 after flying from Sydney to trek to a sacred site near Tibet's Mount Kailash.
"Even the smallest piece of information could help bring her home," a widely shared post on social media announcing her disappearance reads.
A separate group of 15 Australians, including two boys aged 11 and 14, were travelling with US-based tourism operator Himalayan Glacier Adventure and Travel Company.
Sydney doctor Manoj Dharmaratnam, who was invited to join the sacred pilgrimage but chose not to go, prescribed several of his friends altitude medication and conducted injury assessments before they left Australia.
"One of them had an injury and I did tell her, maybe you're not fit to go on this trek," Dr Dharmaratnam told AAP.
"She actually called up and cancelled her trip ... but then she said I've bought the ticket, so I might as well go."
The Himalayan Glacier group included a well-respected Sydney couple with two sons in their 20s, both studying medicine in NSW, he said.
At least four Australians were travelling separately to tour groups, Foreign Minister Penny Wong said on Friday.
Senator Wong said the federal government would send additional personnel to the region and unveiled a $5 million assistance package and humanitarian support.
An initial team of three humanitarian response specialists will be sent to help 20 staff already on the ground in Nepal.
But Chinese and Nepalese authorities say local rescue efforts could be complicated by further flooding, caused by a build-up of debris.
Nepal's National Disaster Risk Reduction and Management Authority on Thursday (AEST) warned a lake was forming above the Rasuwagadhi border.
The Lhendi River had been obstructed about 18 kilometres above the border, posing a risk to residents in areas below, it said in a statement on social media.
The threat of a second flood caused by a blockage upstream led to evacuation orders at Jilong Port on the Nepal-China border, according to the International Centre for Integrated Mountain Development.
Rocks, boulders and debris lodged in the valley, as well as lakes forming along the plateau, could cause further flooding, geoscientist Jakob Steiner told AAP.
"Unfortunately it's not over ... this material is only going to lie there. We cannot move it away," Dr Steiner, a fellow at the Asian Mountain Alliance, said.
"Every time a new flood comes, it's going to move this, and this is just going to increase future flood events in terms of impact."
Nepalese-Australians have come together since the disaster began, holding prayers for those lost to the floods, the missing and the grieving.
A candlelight vigil will be held on the front lawns of Parliament House in Canberra on Friday night after similar ceremonies in Sydney and Melbourne on Thursday.
Australians who need urgent help should contact DFAT's 24-hour consular emergency centre.
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