With only one event before the end of the season, Prevc has collected 1,370 points, a 194-point lead on runner-up Eva Pinkelnig of Austria. Japan's Yuki Ito is in third with 941 points.

Prevc was 11th in the 17 March ski flying event in Vikersund, Norway, finishing 127.7 points ahead of the winner, Norwegian Eirin Maria Kvandal (431.2 points), but this was still enough for her to cement the now unassailable overall lead.

Another Norwegian, Silje Ospeth placed second (425.2 points) and Slovenia's Ema Klinec was third (375.9 points).

Meanwhile, another member of the Prevc dynasty, Domen placed third in the men's event in Vikersund. Austrian Stefan Kraft won the competition to secure the overall men's World Cup victory. His compatriot Daniel Huber was second.

Prevc, who just turned 19 two days ago, was somewhat of a surprise this season, winning her first World Cup event only in December.

She will now become the fourth Slovenian jumper to win the Crystal Globe, joining Primož Peterka, who secured two (1997 and 1998), the oldest of the Prevc's siblings Peter (2016), and Nika Križnar, who won one three years ago.

The World Cup meet in Planica next weekend will mark an emotional finale for Slovenians and the Prevc family, whose four out of five children have gone into ski jumping.

As their youngest claims her first season victory, her oldest brother, Peter, considered by many to be the best ski jumper in Slovenia's history, will be retiring as the season comes to an end on home turf.