Congrats on her acceptance.
Now comes the hard part - one can’t just love a school but they can only attend a school they can afford. Of course, it’s best not to apply to schools one can’t afford but in many cases, one isn’t 100% sure up front.
" People say Scranton is a special place, but is it special enough to warrant that price?"
hmmm - no - you can substitute any school in that sentence for Scranton. Every school has its fans.
In the end, you need a budget and it’s not what you can afford - because it sounds like you can afford Scranton.
But it’s what do you want to afford?
And that’s the budget.
In my case, we are full pay but I set a budget of $50K.
If a school had zero chance to get under $50K, they didn’t even apply.
If they could get under $50K but it wasn’t assured, they could apply.
But they needed 100% definites - and it sounds like you got that.
So the trick here is having a budget - and letting the student know in advance what the max is you’re willing to spend. If that hasn’t happened, see if you can make it happen now.
Maybe you can remind the student that you do need to retire and when they graduate, they’ll need help with rent or grad school or a wedding or whatever - and boy this savings could really help.
Many understand the cost of college and are willing to pay - $90K + per year.
I’m like you - thinking about - in Scranton’s case - a $20K check 2x a year - would make me nauseous 
It’s really about up front planning for where to apply - but that’s done and gone.
But step two is the setting the expectation / budget with the student - and it sounds like maybe that was missed - so you have to see if you can circle back to it.
Congrats to your daughter on her acceptance - but best of luck to you on saving another $20K per year!!!