The young rider dominates in four divisions during the Mississippi winter circuit.

If you collected all of the rosettes that Aleece Jarman won at the Gulf Coast Winter Classics this year, held Feb. 4-March 15 in Gulfport, Miss., the colorful mass could probably bury her, and it would likely weigh more than she does. That’s because Jarman, arguably the busiest rider on the six-week circuit, isn’t a professional adult—she’s a 12-year-old pony rider.