[4] Horner started her club soccer career with the New Jersey Wildcats of the USL W-League.
[2] Following the folding of the WPS as a league and the Independence as a club in early 2012, Horner would return to the USL W-League, spending the 2012 through 2015 seasons with the Charlotte Lady Eagles.
[2] Horner would return to professional play for one final match, getting recruited as an emergency goalkeeper by Western New York Flash after both of their starting keepers were unable to feature on May 23, 2015.
Horner joined the Charlotte Independence organization in 2019 in roles of Director of Goalkeeping and Head Coach in their girls academy.
She was announced as the inaugural coach for the club's USL W League team ahead of the 2022 season.