The star freshman struck with 32 seconds left in overtime, capping the Terps' win over the ranked Cavaliers.
Maddy Murphy's fourth-quarter tally prevented the Terps from upsetting the Hawkeyes.
The Terps crushed their second conference opponent in their biggest win since 2019.
The Terps posted their fourth straight shutout and a 24 shot performance.
"If you can't battle with each other off the field, then there's no way you're going to do it for each other on the field."
Tornetta spent her first three seasons with Princeton where she appeared in back-to-back Final Fours.
The Terps could miss the NCAA tournament for the first time since 1994.
The Terps did not register a shot on goal.
Freshmen Maura Verleg and Anna Castaldo scored their first career goals Friday evening.
The senior has four points in three games.