Tornetta spent her first three seasons with Princeton where she appeared in back-to-back Final Fours.
Donraadt hails from Rotterdam, Netherlands, where she showed exceptional skill at a young age.
The Terps could miss the NCAA tournament for the first time since 1994.
The Terps did not register a shot on goal.
The No. 4-seed Terps will face the No. 5-seed Iowa Hawkeyes on Wednesday for a spot in the semifinals.
The goal lifted the Terps to a weekend sweep of the Scarlet Knights.
All four Maryland goals resulted from penalty corners.
The Terps tallied 13 shots but were shutout Sunday.
Despite outshooting the Wolverines 13-6, the Terps couldn't find a goal.
The Terps had been tough to break down, conceding few chances in matchups against the Big Ten's best teams.