Kelsey finished with an 80 – her worst of the week – for 312, which earned her joint 32nd place in a strong field.
Eilidh had a closing 84 for 335 and joint 56th position while Rebecca matched her best of the four days, an 81, for 336 and a share of 59th place.
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Hide AdMajorca-based Lauren Mackin, a Ranfurly Castle GC member, had the honour of being the top Scot in joint 27th place with a closing 78 for 308.
The event was won by Kyle Roig, a 16-year-old from Puerto Rico, who beat 14-year-old Floridian Alexis Thompson at the first sudden-death play-off hole.