Kaestner came to Monmouth after two seasons as an assistant coach at Ohio State University where she helped lead the Buckeyes to 19 wins, a Big Ten Tournament appearance and a trip to the NCAA Tournament. While in Columbus she served as the team's offensive coordinator, a position she also held at Coastal Carolina. Kaestner spent three seasons and an assistant in Conway, helping start the Chanticleer program while directing the offense, coordinating recruiting efforts and handling academic supervision.

A native of Trappe, Md., Kaestner was a first team All-American at Duke where she finished her Blue Devil career with 93 goals and 98 assists to rank ninth all-time in the Duke record book with 191 points. As a senior in 2011, Kaestner earned first team first team All-ACC honors as she led the Blue Devils to the NCAA Semifinals and was named to the IWLCA All-South Region team in both 2010 and 2011. During her senior campaign, Kaestner set the Duke single-season assists record with 47 on her way to ranking second all-time with 98.