OK, from someone who did the long distance uni thing
Unless you think this is a great great thing and want to get together forever etc etc, then I would say to her, lets test the water, take a break, see if we miss each other etc
Because I can guarantee you, in my experience, I wish I'd broken up with my boy before I went, it caused so much anguish, and whilst I was the dumper, and he was the dumpee, I hated myself for doing it later rather than sooner.
Thats my story tho. Yours may be diff.