Her debut in the Woburn-based tournament provided Mehaffey with a draw alongside former World number one Yani Tseng and America’s Lizette Salas.
Tseng held the top spot in the World rankings for 109 consecutive weeks and Salas is a Solheim Cup player.
Mehaffey missed the cut by four shots - but was more than happy with the experience of playing in her first major.
“It’s not every day you play with a five-times Major winner and a two-time Solheim Cup player in your first-ever Major,” posted Mehaffey, a member of the Tandragee club, on her Facebook page. “What a fun few days on the golf course.
“Not the result I wanted but lots of experience gained. “
Back home around Tandragee, Adam Brown proved the leading player in the weekend Club Stableford with a level-par round of 40 points.
Playing off his four handicap, Brown edged clear of Denver Jameson by a single point.
David Cunningham finished third in the running order on 38 points.
Basil Brown wrapped up the top-four placings thanks to 37 points.
In the Civic Cup, Robin Hanlon and Paul Swaffield finished on 11 up in the pairs-v-par format on Saturday.
Paul Topley and Trevor Burns came home as second over Richard Dennison and Philip Dennison.
The Anna Burnham Memorial was won by Dolores Hamill on a wet midweek course.
Karen Shaw secured second in the competition sponsored by Bella Bridal Studio.