Penn State was outscored 9-2 after jumping out to an early 4-1 lead.
Singleton and Allen have combined for 100 yards twice in the last six games.
The Nittany Lions converted on three fourth downs on the last drive of the game.
The Nittany Lions had nine tackles for loss and two turnovers.
A gutsy final drive won a game that came down to the wire.
The Lady Bulldogs were the first team with an active winning record Penn State's played this year.
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