Gemma Owen, from Northop, Flintshire received news of her selection, for The Team GB Prime Dressage Squad, after an impressive ride-out in front of selectors.
She had already been selected for the Welsh Dressage Team for the second consecutive year.
Gemma, a Year 7 pupil, also recently competed for Wales in an inter-regional competition for under-25-year-olds. She came fourth individually in her section against competitors from all other UK regions.
Gemma was also awarded the BYRDS (U25) Wales Rider of the Year for her successes at the Inter-Regionals and Home International during 2013/14 where she won the Novice Championship for U16s.
Ian Abell, who organises the school’s Equestrian teams, said: “Gemma is an extremely talented equestrian and it is no surprise to us that she will now be competing at an international level. We wish her luck with the Team GB competitions.”