Katie DeSa was 24-for-24, shutting out Robert Morris.
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.
"One of the strengths of this team is depth. We've been saying it all season long..."
This was the highest-ranked class in Penn State history.