Haha, To be honest, your Girl doesn't look like shes really wanting to spend her life with you if shes giving you such a hard choice.
(sorry if i was unnecessarily judgmental).
I am currently in a long distance relationship where my girlfriend lives in Sydney, and I in Brisbane, and Its hard to start with, but tends to get easier, but you can't keep an eye on her if she was to be unfaithful or anything, but then you ask yourself if she is the right girl if you have to ask those questions.
But anyway, can't you organise to take out a weekend every month or something to go see her for a bit?
I personally think that if a girlfriend gives you a choice between you and her dream, she probably isn't the right girl.
(Mine has a 'thing' for pilots :P, and I'm just training to be one
)