Alannah Crockatt secured third place at an inter-club diving event at Albatross Diving Club.
The Rickmansworth school girl was in action in the the girls’ A group, competing against girls between the ages of 15 and 18.
The event, held in Reading, was celebrating 25 years of inter-club competition.
A Year 10 pupil at The Royal Masonic School for Girls, the 15-year-old is also captain of the dive team at Amersham Swimming Club.
She will be in a club party which will travel to Graz in Austria later this summer for a training camp.