Hannah Brooks showed up her county colleagues at the English Schools Cross Country Cup at Kingston.
Sussex schools were unable to provide a winner but Brooks (Crawley), who attends Oxted School in Surrey, was a convincing winner of the intermediate girls' race in 11min.05sec.
Brooks' dominant display only added to a frustrating day for Sussex who had four schools in the last four but none went on to reach the final.
Cardinal Newman performed best, getting three teams through to the semi-finals. Their junior girls under-13 team achieved the highest placing for Sussex by finishing seventh.
Newman's Hannah Curtis, the reigning Sussex schools year-seven champion, had a fine run to place sixth, three places ahead of Sundai Boulton. Sister Bethan Curtis came 38th and Lauren Young was 55th.
The Brighton school's intermediate girls team came ninth with Catherine Rowen placing 16th, Therese Curtis 36th and Hannah Devlin 39th. Bethany Lagaay also finished.
In the junior boys' race, Cardinal Newman's Sonny Burchell had a brilliant run to finish fifth with schoolmates Alex Bowden and Cathal Kane coming 49th and 65th respectively.
Patcham High School's intermediate under-15 boys team were ninth in their field with Wesley Fogden (17th), Ashley Witcomb (28th), Josh Kelly (44th), Luke Bonwick (47th), Sam Whiting (54th) and Richard Brookes (57th).
Varndean's Alex Ashton-Ward (21st), Joe Howard (57th) and Stephen Chong (58th) also contested the intermediate boys' event.
Dorothy Stringer High School took part in the intermediate girls' event with Danielle Svobda finishing 28th, Harriet Dack 31st, Jess Heasman 48th, Kayleigh Mellars 57th and Charlotte Harman 59th to ensure 12th place for the team.
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