[1] Natalia Sidorowicz made her international debut at the 2016 Youth Olympic Games in Lillehammer, finishing 46th and 41st in the sprint and pursuit races.

The following year, Sidorowicz won her first individual medal, securing bronze in the mixed relay at the 2018 IBU Junior Open European Championships with Joanna Jakieła, Przemysław Pancerz, and Marcin Szwajnos.

At the European Championships, she excelled in the pursuit competition under extreme conditions, being the only athlete to hit 18 out of 20 targets and improving her position by 33 places to finish eighth.

In the winter of 2022/23, Sidorowicz consistently competed at the highest level, narrowly missing her first World Cup points by finishing 42nd in the sprint race in Le Grand-Bornand.

In August 2023, she narrowly missed her first senior-level medal, finishing fourth in the sprint event at the Summer Biathlon World Championships.