Cowgirl Jessica competes in Texas
A total of 15 countries worldwide will compete.
Jessica, of Drayton Place, Bexhill was chosen through a selection process at events throughout the UK.
Her aunt, coach Sussannah (OK< repeat OK) Anderson who trains riders at her stables at Bodiam, will accompany the team.
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Hide AdSussannah tours Britain coaching at UK events. She said: "The riding style is traditional, holding the reins in one hand only, cowboy style.
"Jessica is one of five helpers, backing the team of five young riders. She may well become a competitor if a rider drops out, for any reason. "This type of riding has a growing following in the UK of around 2,000, of which a small number enter competitions."
Jessica's mother, Mrs Jenny March, said: "We are thrilled that Jessica is included in the team, but we have to raise cash for the trip."
Entry fees, hotels and expenses for the team of 10 is around 4,000, plus flights.