Welcome back to Pittsburgh. CMU is a great institution- impresssive.
As far as parking goes— this is really your call. You will find parking around the stadium for around 40$ if I remember correctly. One thing I would suggest normally to out of towners is park at the Rivers Casino; however, since your daughter may not be 21 she won’t be able to get in and out.
However, driving can be very confusing around the city... My best suggestion would be to use Uber to go from your hotel to the game. If you’ve never used Uber your daughter may have since she’s in college. That way you don’t have to worry about parking.