The fire broke out yesterday and razed the house to ashes within minutes, police said.
No loss of life was reported but property worth lakhs of rupees were destroyed in the fire.
The fire destroyed Mena's passport, cameras, laptop, all her summit certificates including the one she had earned for scaling Mt Everest, they said.
Her mountaineering equipment worth lakhs of rupees were also reduced to ashes, said police.
Mena was away shooting for a documentary film in Nizamghat near Dibang river when the incident took place.
"He saw smoke billowing from the roof. He rushed back but by then fire had engulfed the whole house. Mena's father suffered serious burn injury in hands when he tried to save precious belongings," Elapra said.