
The Italian, who took a one-shot lead into the final round, won with an 11-under-par score of 205, putting her four strokes clear of a trio of players.
The 26-year-old from Rome had a bogey-free final round of four-under-par 68, enabling her to finish clear of France's Gwladys Nocera (69), England's Florentyna Parker and Sweden's Sophie Gustafson (71).
Parker finished with a round of 70, a double bogey on the 15th denying the 20-year-old, Germany-born Briton a chance to put pressure on Luna in the closing holes.
Gustafson, a three-time winner of this event, slipped out of contention after double bogeys on the fourth and sixth.
Scotland's Krystle Caithness finished fifth, a further shot back on six under par, with England's Melissa Reid one behind her.
The event finished late because of two delays for fog. The final round was suspended for 30 minutes from 9.50am due to a dense sea fog which rolled in from across the Irish Sea - and there was a second suspension of more than three hours at 1pm.
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