Örtengren, who has received her golf upbringing at Landeryds GK, shared the lead with German Leonie Harm before the third and final round.
Harm started best with two straight birdies, but Örtengren was not late to respond and made birdie on both the third and fourth.
Thereafter Örtengren pulled away, but with a four-stroke lead and two holes left it became shaky.
The Swede made a double bogey on the 17th at the same time as Harm made a birdie – and the lead had suddenly shrunk to just one stroke.
Then Östgötskan finished with a birdie to win with a total of six under par, two strokes ahead of Harm and Swedish Lisa Pettersson.
Meja Örtengren has for several years been seen as one of the great promises in Swedish golf. She has been involved and won the Junior Solheim Cup with Europe, qualified for the British Open earlier this summer and is ranked eighth among the world's amateurs.
Since last year, Örtengren has her base in California, where she studies at the prestigious Stanford University. Professional life will likely have to wait a few more years for the Swedish giant talent.
