Katie DeSa was 24-for-24, shutting out Robert Morris.
Elliot Washington II and Kaden Saunders are listed as out.
The game will be broadcast on CBS for the second straight week.
Penn State roared back from an early three-goal deficit but ultimately fell short.
Kaitlyn MacBean's goal in the 46th minute proved the difference.
Four different Penn State skaters found the score sheet in a dominant victory.