Despite a slow offensive start, Penn State squeezed out enough runs to earn its first conference win.
Brown was the final of three players from the Micah Shrewsberry era to hit the portal.
The four-point overtime victory came after Penn State was down by 12 points in the fourth quarter.
The Lady Lions came back from a late-game deficit to advance in the tournament.
Marr leads the Nittany Lions in hits this season with 34.
It hasn't always been pretty this season, but sitting at No. 9 in the country with a record of 15-6, the Nittany Lions are finding ways to grind out wins.