Tandrevold has had to take on more responsibility this season since Norway's two biggest names Marte Olsbu Röiseland and Tiril Eckhoff withdrew from the competition due to prolonged health problems.
The 26-year-old has had a good start to the season and is fifth in the overall World Cup after, among other things, three podium places.
She has a history of collapses behind her.
The most painful was when at the start of the chase over 10 km in the Olympics in Beijing at high altitude last winter, she fought with Elvira Öberg for the silver and completely went into the wall and lost a minute in the last kilometer.
They were harrowing images that reached far beyond the world of biathlon.
"97 failed athletes"
To keep his body in check, Tandrevold is now trying to fit in as many high-altitude stays as possible, a step in avoiding collapses and a path to the Olympics in Antholz (Milan) in about three years.
This means that she foregoes Christmas celebrations at home in Norway and remains in the Italian Alps.
- For me, it is very important to get in some extra altitude training.
There are some who find it easy to adapt to high altitude, and then there are some who do not, and I am one of them, says Tandrevold to NRK.
She also tries to have a positive attitude towards the sport, where the mental aspect means so much.
- It's not like everyone reaches their goals, it's impossible.
There are usually three on the podium and 97 failed athletes.
It made me realize that I must dare to enjoy the road to the goal more than I have done, says Tandrevold.
The World Cup restarts in Pokljuka, Slovenia, January 5-8.