2022: Appearing in 25 matches for the Lady Jackets, Brittain finished first on the team in assists (297), second in digs (210), and third in blocks (21). She also recorded 75 kills on the season. Brittain received ASC Academic All-Conference as well.

2021: Appearing in all 25 matches, Riley led the team in assists with 338 and was third in digs with 156 and second in service aces with 13. In addition, she had 17 kills and four blocks. She had a season-high 30 assists versus Occidental.

2020-2021: Appearing in all 22 matches for the Lady Jackets, she led the team in assists with 327 and was second on the team in service aces with 12 and in digs with 178. She registered nine kills versus Mary Hardin-Baylor. Riley also excelled in the classroom, receiving academic all-conference.

HS: Riley played two years of Volleyball while attending Seguin High School in Seguin, Texas.  While there, Riley was named Newcomer of the Year her junior season on a team that were District Champions and All-Area Champions.  She also received First-Team All-District honors and Academic All-District accolades both her junior and senior years.  Riley also participated in powerlifting while at Seguin High School.

Personal: Riley is the daughter of Dusty and Angela Brittain and has one sibling.  She is pursuing a degree in elementary education.