The Spartans scored three unanswered goals to down the Nittany Lions in overtime.
Kiara Zanon scored two shorthanded goals in quick succession for the 100th and 101st points in her career.
Liam Souliere's 15 wins in a season are fifth-most in program history.
"It's January 11, and we plan on playing through March."
Schlegel will join teammate Penelope Hocking in Chicago with the Red Stars.
Penelope Hocking will join fellow Penn State alum Alyssa Naeher on the Red Stars' roster.