Ball bolsters the Terps defense after four years at Rutgers.
The Terps had high expectations entering the 2023 season, but their talent never coalesced as they fell in the first weekend of NCAA tournament play.
The Terps gave up the last five goals of the game after leading 14-10 with under ten minutes left.
Terps attacker Libby May will face her former high school teammate Isabella Peterson in Sunday's NCAA tournament game against the Dukes.
The Terps will face James Madison on Sunday at 1 p.m.
Lamoureux has provided a much-needed consistency with her energy, outlook and reliability to a revamped Terps defense.
The Terps scored nine goals and shot just 28.1 percent against Northwestern in the Big Ten championship.
The Terps defeated the Dragons 15-9 in their regular season matchup.
The Terps were outscored 7-3 in the second half.
The Terps will play for their fifth Big Ten championship after outscoring the Scarlet Knights 10-1 in the first half.