UPDATE: Toowoomba teen Alyssa Azar has been attacked over plans to push ahead with her attempt to climb Mt Everest in the wake of an avalanche that killed 13 Sherpa guides.
The 17-year-old's father Glenn has told media he and Alyssa have received nasty emails - some containing "vile" material - critical of Alyssa's decision to continue with the adventure.
Many of the emails have come from "anonymous" people, Mr Azar said.
He has said he would support Alyssa regardless of her decision.
EARLIER: Sheer will may not be enough for Alyssa Azar to continue her Mount Everest expedition.
The future of her trek is uncertain as the Nepalese government considers cancelling all expeditions to the mountain's summit for the rest of the year.
Friday's avalanche, which killed at least 13 Sherpa guides, has raised concerns in Nepal about the scale of the climbing business and the dangers to the Sherpa guides.
Sherpas are an ethnic group in Nepal and being natural mountaineers have long guided foreigners' expeditions.
Three guides were still missing after rescuers called off the search.
Alyssa's father Glenn said he had been talking to his daughter via messages since the avalanche.
"There's been no decision made yet. It's up to the authorities and if they say it's over, it's over," he said.
"She seems to be going alright. She intends to keep going."
Mr Azar said he would support his daughter whatever decision she made.