She was officially listed as missing by New Zealand Police earlier this week, while her father Paul and her sister Stephanie have both been hospitalised.
Browitt's mother, Marie, was unharmed by the disaster, having opted not to tour White Island and remaining on the cruise liner that day.
A Gofundme page created to support the Browitt family has raised $46,000.
A GoFundMe page appealing for funds for American newlyweds Matt and Lauren Urey has reached more than $20,000.
The couple were on the cruise for their honeymoon, and had gone to White Island for a hike.
The page was established to offset costs "related to their unexpected and extensive medical stay and related expenses".
"The family extends their sincere appreciation for your concerns and prayers," the page reads.
Rick Reed and Ivy Kohn Reed. Photo / Facebook
Sydney couple Nick and Marion London have been flown back to Australia for treatment but face multiple surgeries and weeks, possibly months, recovering in hospital.
Both have burns to 50 per cent of their bodies along with internal burns from breathing toxic chemicals.
Son Matt paid tribute to the pair as incredible parents, saying dad Nick is a "gentle giant" and rock of the family, and mum Marion is filled with kindness and love.
Nick London, of Sydney, Australia, was injured at White Island with his wife Marion. Photo / Facebook