The Tritons have won a school-record 45 games in each of the past two seasons and have made back-to-back appearances in the NCAA Division II national title game. UCSD finished runner-up in 2012 after winning the national championship for the first time in 2011.

Millsap helped UCSD to earn National Fastpitch Coaches Association (NFCA) Division II National Coaching Staff of the Year in 2011 on the heels of the program's first-ever national championship. The staff then went on to earn NFCA West Region Coaching Staff of the Year in 2012.

Primarily working with Triton pitchers and outfielders, Millsap guided a 2011 Triton pitching staff that had the eighth-lowest ERA (1.44) in the nation and the lowest ERA in the California Collegiate Athletic Association (CCAA). Ace Camille Gaito finished with the second-most wins in the nation and the fourth-lowest ERA. Moreover, UCSD regular starting outfielders Kris Lesovsky, Katrin Gabriel and Taylor Sepulveda all boasted a perfect 1.000 fielding percentage.

Between January 2007 and May 2009, Millsap served as the top assistant coach for Biola University, helping the squad to an overall record of 77-63. The 2007 campaign turned out to be especially spectacular as the Eagles advanced to the second round of the NAIA Region II Tournament under the leadership of Jessica and her sister, head coach Carissa Kalaba. Carissa is now the head coach at Utah State.

Before her experience at Biola, Millsap spent time as an assistant coach for the Jets Gold 18U squad in Agoura Hills and head coach at nearby Arcadia High School.

Millsap graduated from Chatham University in 2007 with a Bachelor of Arts in political science. As a senior there in Pittsburgh, Pa., she captained the Chatham Cougars' softball team while earning "Most Valuable Player" honors.