Irbe was a standout performer on Butler's volleyball teams in the mid-1980s. She was a four-year letterwinner, a team captain (1987) and a Butler Most Valuable Player (1987). As a junior, she was named Butler's Most Outstanding Offensive Player and Butler's Co-Most Outstanding Defensive Player. Irbe was a first team All-North Star Conference pick in 1985 and a first team All-Midwestern Collegiate Conference performer in 1986. She remains Butler's all-time leader with 202 solo blocks and Butler's single season record-holder with 88 solo blocks. Her .318 hitting percentage in 1985 still ranks third on Butler's single season list, and she stands third on Butler's career list for blocks with 517.