The Swede clocked a combined time of 1min 54.86sec over the two runs down the Podkoren 3 slope to finish a massive 1.42sec ahead of Italy-born teenager Lara Colturi, who races for Albania.
The victory, Hector's second of the season, saw the 32-year-old go top of the overall standings on 407 points, 24pts ahead of Switzerland's Camille Rast.
New Zealand's Alice Robinson rounded out the podium in the Slovenian resort, a further 0.10sec adrift.
Austria's Julia Scheib had laid down the fastest second run, but could only finish fourth.
