Casey attended Stanford University, where she studied Public Policy and competed on the women’s golf team. During her time at Stanford, Casey helped the team win the NCAA National Championship in 2015 and had eighteen top-10 individual finishes. Casey was also the recipient of both the Dinah Shore Trophy and the Tom Cousins award, both given to a female golfer excelling in golf, academics, and community service.
In May of 2017, Casey turned pro following her college graduation. During the summer, she qualified for the 2017 US Women’s Open and competed in the Thornberry Creek LPGA Classic. In December, Casey earned status on the LET by winning Lalla Aicha Tour School in a three-way playoff and earned her card for the 2018 season.