May I jump in here and ask a question?
I believe I read somewhere that Maura had packed up all or most of her belongings in her dorm room.
If this is true, then that is a big red flag that she may have been contemplating suicide.
Suicidal people often "clean up" their surroundings, so that their
loved ones don't have to do it when they are already suffering from their
loss.
Coupled with the fact that she brought some very sentimental items with her on her trip, like her favorite stuffed animal from her boyfriend, jewelry etc, and the fact that she bought alcohol (liquid courage).
Also, if you factor in the (alleged) phone call to her boyfriend with muffled sobs...that would lend even more credence to the suicide theory.
In addition, law enforcement seems to feel that she very well may have been suicidal...and they may have found something which indicated that and they are not sharing it with the public.
PLEASE do not flame me if Maura simply packed her things because she was
transferring schools in the next few days.
Once again, I am only trying to explore EVERY possible angle.