Third seed Joshana beat the Dane 11-5, 11-4, 11-9 in the final of the WSA event. It was only last week that Joshana lost to Line in Kooyong.
The Indian's last triumph had come in the Richmond Open in April last year.
Known for mixing strokes and accuracy in the placements, the Joshana held the upper-hand right through, though she admitted, it was a "hard game" particularly after Line fought and brought the score to nine-all in the third game.
With the Australian Open to start in a few days and the venue being the same, the Joshana is looking forward to more success.
"I am so happy it will be at the same centre," she said.
The title in the men's section went to Australian Ryan Cuskelly who beat Greg Lobban of Scotland 12-10, 13-11, 11-9.