In 2018, Mahuchikh cleared 1.94 m at the European U18 Championships and won the gold medal with 10 centimeters ahead of the runner-up, setting a new championship record. In mid-October she won the gold medal at the Youth Olympic Games in Buenos Aires with the combined height of 3.87 m and set a new personal best of 1.95 m at stage 2. A month after her youth Olympic success, Mahuchikh improved her personal best to 1.96 m and equalled the World U18 best in an annual indoor meeting in Minsk.