I was going to suggest something similar. My daughter started our house on fire with an inscent In her closet (ugh ) she put it there because I am allergic and in her 16 year old mind in her closet -it wouldnt bother me there . well it caught all the clothes on fire. then it spread because she had hoarded a bunch of dried flowers and floral arrangements. I washed her stuff (what was left lol ) in odo ban and rinsed with ammonia and hung out to dry on the line .it worked I think it took twice though.
tell your friend Im so sorry , I know Its devastating I was lucky ,my fire was only one room and my neighbor put it out before the fire trucks got there and our only damage was "stuff" not the house and the people and pets got out ok.
but my daughter was very emotional for a while .