EVANSTON, Ill. — In a matchup of the two top scoring teams in the Big Ten, Northwestern’s Chelsea Armstrong converted 12 seconds into overtime to give the Wildcats a 5-4 win over Penn State on Friday afternoon.

The tally completed a hat trick for Armstrong, who has 19 goals on the season and also forced overtime with a score with 6:33 left in regulation. Armstrong’s diving redirection of a feed from Tara Puffenberger from 21 yards away beat Ayla Halus on the winner.

Laura Gebhart, Ashtin Klingler, Brittany Grzywacz and Hannah Allison scored goals for the No. 6 Nittany Lions (10-3, 2-1), who had a seven-game win streak halted. Whitney Reddig had a pair of assists and one each came from Allison, Lauren Purvis and Jenna Chrismer.

“We had a lot of chances,” head coach Charlene Morett said. “I thought that their goalkeeper played very, very well. I just think that we had a lot of close chances to try to get a few more goals, and we just couldn’t.”

Charlotte Martin and Lisa McCarthy added goals for the Wildcats (10-2, 1-1).

Halus made one save in the loss while Amanda Wirth had six for Northwestern, which was out-shot 16-11.

Penn State is off until Oct. 7 when it hosts California.