Lovisa Sjoberg, 48, was located shortly before 5pm on Sunday on the Nungar Creek Trail at Kiandra.
She had not been seen since October 15, when police believe she was spotted driving a car in the Kosciuszko National Park.
A National Parks and Wildlife official found Ms Sjoberg on the Creek Trail, where she was immediately treated for a suspected snake bite.
She was taken to Cooma District Hospital in a stable condition.
Ms Sjoberg, who is also known as 'Kiki', was officially reported missing on October 21 when police began an inquiry into her whereabouts.
Local horse track operator Peter Cochran, who was involved in the search, said she would often head into the wilderness and take photos of brumbies as she was a "devout supporter" of their cause.
He said tracking Ms Sjoberg down was the result of an "intense" effort by volunteers and community members along with officials.
Police officers including from the horse and dog units, SES, National Parks and Wildlife Service, Rural Fire Service and a Surf Life Saving Helicopter were all part of the search effort.
"The scrub is incredibly thick ... you could ride within five metres and not see (a person) because the regrowth as a consequence of fires in 2020 has left an incredible amount of scrub up there, dense scrub that you've got a job to ride through," Mr Cochran told ABC Radio South East NSW.
"Kiki was a devout supporter of the brumby cause and photographed many of those horses which are now deceased, so it was no doubt an emotional drain on her and all of us involved."
A number of Facebook groups were set up, where hundreds of people organised searches and shared information to try and crack the case.
