Your comment about her attending college explains a lot in my mind. Attending college can be a life changing experience. I think this is often true for women who go to college a number of years after they graduate from high school. It can have a radical effect on their self-image and view of life. Usually this is for the better. However, it is a dangerous time for relationships. Relationships that were formed with the earlier person have to evolve as the new person develops. Sometimes this happens naturally but often it produces fractures in the relationship.
If I am anywhere near the mark and you have an opportunity to talk to her, make sure you support the new person she can be as well as the person she was.
Best of luck. Remember we are always hear to listen even if we can do nothing else (besides giving diesel advice which we are much better at).

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13