Apologies if u have already answered this, but you mentioned that there was a lot on her mind. Have u sat down and talked about what's bothering her? Personally I hate it when so's say that the problems are personal and they don't want to burden you with their problems because the latter is exactly what ends up happening! Their problems overwhelm them and that results in stress and problems in the relationship and a decrease in the quality of our lives. Judging by how you feel for each other and where you want this relationship to go, I think she needs to share her problems and confide in you and you need to take on some of the burden that's weighing her down. Even if you aren't able to help her solve anything, at least you can stop playing the guessing game and driving yourself insane with theories and talking things out will make her feel better.
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