“I put in a good lot of work, so it’s nice to see that it has paid off. My irons again on the back nine were really good, I put myself into good positions and I had a few nice putts.”
Costello had a solid front nine and birdies on five and seven paved the way for a six-shot lead at the turn. Lee-McNamara’s chances looked to have faded at that point, she bogeyed the first and followed up with another bogey on the seventh.
And there was no run coming from further down the field, Emma Ear (Golf de Fontainebleau), Selina Bartarya (Royal Blackheath) and Ella-Louise McCorry (Lurgan) were the only other players under-par for their front nine.
But Costello surged clear and five birdies followed, including three in a row between 11 and 13, while she finished with a flourish with putts dropping on 16 and 17 as she claimed another girls’ title.
“It’ll bring good confidence in my game. See what I’ve done in the last couple of days and weeks and months, they’re starting to pay off,” said Costello.
“Especially with it being my last year U-18, it was a nice way to finish. The Junior Solheim Cup is a goal.
“I’ll play in a few events and just see how it goes and if I give myself the opportunity to make it then that’ll be great.”