Born and raised in Saint Louis, Missouri, Jillian began playing sports at a young age. In high school, she focused on volleyball, committing to Saint Louis University to continue pursuing her academic and athletic goals. Freshman year, she was named to the All-Rookie team and later collected First and Second Team All-Conference accolades. Equally as important, she has been named to the All-Academic team consistently during her time at SLU. She is a senior studying to complete a B.S. in Finance and Economics.