The 5-foot-10 junior setter led the Wildcats to a 52-1 record and the Class A state championship this past season. O'Leary amassed 1,451 assists, 361 digs, 203 kills and 76 service aces while posting a kill percentage of .510 and a hitting percentage of .462. A two-time MaxPreps First Team All-American, she was a member of the 2016 USA Volleyball Girls' Youth National Team, which placed second at the North, Central American and Caribbean Volleyball Confederation (NORCECA) Girls' U18 Continental Championship this past September.
O'Leary has maintained a 4.0 GPA in the classroom. She has made a verbal commitment to play volleyball on scholarship at the University of Michigan beginning in the fall of 2018.
O'Leary has volunteered locally as part of an elementary school literacy-outreach program and as a youth volleyball coach. She has also donated her time to multiple community-service initiatives through her church youth group. "Erin has a great sense of the game," said Aaron Smaka, head coach of Grand Haven High. "She has a very high volleyball IQ and is one of the best decision-makers as a setter as that I've seen. She is the engine of that team."
