Kelly represented U.S. Zone 1 at the North American Junior and Young Riders’ Championship on five occasions.
Kelly and Cacharel began competing together during the 2017 season and, based on impressive results at the international level, were named to the United States Equestrian Team for the €250,000 CSIO5* Longines Nations’ Cup in Coapexpan, Mexico, marking Kelly’s Nations’ Cup debut.

Competing as a professional, Kelly works full-time as a rider, trainer, and the manager of Millar Brooke Farm. She continues to ride for her family’s farm, Bridge Brook Arms, based in Wellington, FL, and founded by her parents, Mary Christine and Robert Soleau. In December of 2015, Kelly married Jonathon Millar in Florida. A true animal lover, Kelly is rarely seen without her pack of Welsh corgis in tow. In addition to a regular pilates regime, Kelly enjoys interior design and renovating both houses and barns.