Hennessy, a freshman, was nominated by St. Paul's School for Girls athletic director Erin Howland , who described her as "the sprint team workhorse."
Running track for the first time, Hennessy ran in individual and relay events while competing in the maximum event limit of four events during every meet this season.
"She is everything that we look for in a student-athlete here at St. Paul's School for Girls," Howland said during the award presentation. "She does great in the classroom and on the athletic field. She's committed, she is respectful of her teammates and she is so supportive of everyone in our entire athletic program."
Hennessy's 4x100 meter relay team set a school record with a time of 54.10, taking first place in the league meet April 26. In the 100-meter dash, she led the Gators with a team-best and school-record 12.70.
But for Howland, Hennessy's contributions extend beyond the race results.
"Best of all, Annabel is always present and brings a positive attitude to every workout and meet," Howland wrote in her nomination. "She sets a great example for her teammates with a tireless work ethic and is willing to do whatever it takes to help her team."
And for Hennessy, that means looking ahead to next season already.
"This is such a great honor," Hennessy said. "I had a really great track season, and I can't wait for next year."
Off the field, Hennessy is active in her church youth group and volunteers to help feed the homeless.
"St. Paul's has really helped me discover who I am and what I want to do with my life," Hennessy said.
And while she may not know exactly where her path will lead in the years ahead, Hennessy said it will somehow involve helping those less fortunate.