- One of the best breaststroke swimmers in the 2013 class nationwide, Callahan was ranked No. 42 nationally by collegeswimming.com and is the top swimmer this season coming out of the state of New Jersey.
- Attended Atlantic City High School, where she competed for four seasons on the swim team and served as captain for a year.
- A three-time New Jersey high school state champion in the 100 breaststroke (2:01.54) as well as the 200 individual medley (1:01.29), setting state records in both events.
- Named the Atlantic City Press Athlete of the Year in 2012 and the Swimmer of the Year the last three seasons.
- USA Swimming Scholastic All-American
- Competed at the 2012 U.S. Olympic Trials