The Terps also picked up a commit in football and two in baseball.
The graduate transfer almost decided not to use her remaining year of college eligibility before making the switch to College Park.
The Terps crashed out of the NCAA tournament once again.
The Terps will take on No. 14 Cornell Sunday in the second round of the NCAA tournament.
Costabile only committed to the Terps this past summer and was a unanimous Big Ten all-freshman team selection.
The Terps won’t get a bye and are unseeded in the national tournament, but will make their 22nd straight appearance.
The Terps notched back-to-back conference wins to end the year, but still didn't qualify for the Big Ten tournament.
The goalkeeper helped the Terps to a national championship in 2018.
The Terps's 2023 class is ranked No. 9 by ESPN, and a host of other programs announce signees that are set to join teams next year.
The Terps couldn't overcome a two-goal deficit and hit two crossbars on potential game-tying shots late in the match.