Hannah Heyward set up Forbragd’s goal in the 52nd minute. Heyward’s pass from the right side found Forbragd in the middle and she converted for her 13th goal of the season.
Rattigan capped the scoring in the 59th minute off assists from Forbragd and Day.
O-State improves to 10-4. It will travel to play the University of Scranton at 4 p.m. Thursday.
Hartwick (4-10) will play at St. John Fisher at 11 a.m. Saturday.
Cobleskill 3, Green Mountain 0
Senior Amber Baker had nine aces and five kills, and Kady Porterfield contributed eight aces and five kills to lead host SUNY Cobleskill to a 25-7, 25-10, 25-12 non-conference victory on Senior Night.
The Fighting Tigers (10-14) finished with a 28 aces in a match that took 49 minutes to complete.
Senior Casey Holbert had 10 assists and five aces for Cobleskill, which will travel to Morrisville, N.J. on Friday for North Eastern Athletic Conference Inter-Divisional play.
SUNY Delhi finished sixth out of nine teams in the ADPRO Sports Invitational on Monday and Tuesday at the par-72 course at Turning Stone.
The Broncos finished with 946 strokes in the 54-hole tournament. St. Thomas Aquinas won with 885.
Dill Walsh-MacGregor led Delhi with a T17th-place finish. He shot rounds of 78, 77 and 78.
James Partridge finished 22nd for Delhi. He followed an opening-round 81 with a 79 and a 76.
It marked the final event of the fall season for Delhi.