What ARE the terms of the lease, as far as you ending the lease the taking her back?
As far as the emotional side goes, no, it's never the same to ride someone else's horse than it is to ride your own. I spent 4 years in graduate school away from my horses. Couldn't afford to have them travel with me and wouldn't have the time anyway. I found horses and people to ride with during that time, but it just isn't that "ah old comfy couch" feeling you get on your own horse. It sucks, but it can be done.
Although I'm curious as to why you leased her out now when you aren't starting school for over another year in spring 2014?
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.