The Nittany Lions' midfielder netted her three goals all in the first half, and the Terps had no answer.
Hope Lewandoski's early goal wasn't enough for the Terps to overcome the Illini.
The Terps took their first point against a Big Ten opponent in seven games.
The Terps broke through once but otherwise struggled to find space against the Buckeyes.
The Buckeyes forward headed the winning ball to send the Terps to a loss in their Big Ten opener.
Cappelletti, the Hawks' goalkeeper, registered 11 saves as the Terps couldn't break through.
The Terps' attack returned to form, knocking three goals past the Colonials at Ludwig Field.
"We saw a lot of fight when we went down," coach Ray Leone said.
The Terps scored in the opening minute of the game, but struggled to keep up with the Midshipmen's attack.
Catherine DeRosa's 74th-minute penalty lifted the Terps to their third straight win.