Please do not take this personally, but
Just relax, take it easy and problems tend to work themselves out. Besides, both of you have your whole lives ahead of you don't become wrapped up in this as it will ultimately affect the relationship and yourself.
My advice, keep your distance (not literally), but keep in close contact and show that you support and admire her decision to concentrate on her work. Yes, it may hurt you that she is not 100% dedicated to you atm, but she has her own life to live and if a degree is what she wants to do, respect that and support her and if she has any sense she will realise that you want the best for her.
Relationships are essentially an elongated compromise, and if the compromise does not work for both of you it may not be right...But if your love is strong the relationship will last through everything, and this will almost certainly be the case
Also, about other people telling you to check on her and see if she is available for others etc, please do not do this as this will ultimately come back to haunt you, as she will see it as that you do not trust her. It will also hurt you more, if you find something out
Please do not see this as me disagreeing with you, as I fully support and understand your problem, but just realise both of you have your own lives...