She defeated fellow English players Laura Davies and the defending champion Trish Johnson by a three-stroke margin at 14-under-par 274 (61-68-70-75).
Davies and Johnson tied for second at 11 under par 277. Karen Magrethe Juul from Denmark claimed fourth position at nine under par 279. Rebecca Coakley from Ireland finished fifth at 8 under par.
Welsh number one Becky Morgan carded a level par 72 to share sixth position with Maria Hjorth from Sweden at 7 under par.
Those inside the top ten, who earn Solheim Cup points, were Denmarks Iben Tinning and Englands Lora Fairclough, who tied for eighth place, Nienke Nijenhuis, Liza Walters, Ana Larraneta and Anja Monke, who tied for tenth position.