Wait, I am confused - the way I understood this, you both got into a top tier school - but just not your "dream" school.
Uhh- isn't the dream to get into ANY top school? I dunno, the thought of going to a great school WITH my partner of seven years, and sharing that experience sounds GREAT. You have a built in study partner, roommate, person to vent to on bad days.
OR you could move 80 miles away, become horribly jealous when she starts studying late nights with the new guy "Brad." You can spend constant hours driving instead of studying, and watch your relationship slowly drift away over the next four years.
I am pretty sure from the way you frame it that you are going to choose your "dream school" over your woman, but uhm, in four years, school will be over, and so will your relationship. Try snuggling up to that diploma to keep yourself happy and you will see it won't work.