You haven't seen your fiance in a year is a issue all to its self. Sounds like first thing is you don't have time and location for each other for a relationship. Also im almost positive she is seeking someone else and trying to see if the grass is greener on the other side. If you can't both be together in the same area or house and work and come home to be with each other then its not gonna work out. The biggest thing of all is when she says she wants to wait for school to be over translates into "I will meet a lot of guys and do things at frat parties" if she isn't tied down then she has nothing to feel guilty about when she does it. I have noticed along with many other studies that this is the age and decade of cheating and lust.
Men and women alike will cheat more and more these days and divorces are on the rise more than ever. People are marring younger and having kids just to end up being divorced before they are 25. Swinger parties and bi relationships are also on the rise due to lovers not wanting to just be with one person at a time but a few as long as its mutual. College is like it always is "Party Central" Kids only wanna go to school for fun and end up dropping out due to low grades or felling semesters from lack of studies from parting.
To sum it all up i say she is not trust worthy and is hoping you make a move first to end it. Id find a girl who has the time and is willing to relocate with out for not only work but for loves sake.