It's not all that difficult to keep in touch, you can Skype, use a messenging program, telephone calls, hell you can even write a good old fashioned letter (actually it's really nice to receive a letter as it's fairly unusual now for personal correspondence).
One thing I suggest you do is plan a couple of dates during the year when you're going to come back and visit her or she can come across to see you, that way you've got something to look forward to and it will split up the time away. However maybe wait until you've had a bit of a chance to look about and find out what is going on in France first, it wouldn't be good to book yourself up on the same day as the circus is coming to town/strippers descend on Bordeaux/field trip to CERN/whatever appeals to you - all I'm saying is give yourself a chance to see what is going on rather than immediately setting up something before you know what else you could be missing.
Good luck with the trip and the studies though.