Sorry to hear it, but it sounds like pretty typical stuff for a woman...
They are SO emotional, and then they think about stuff, and sometimes they think too much, and sometimes not enough, and sometimes come to some pretty weird conclusions... A lot of times women just don't have the first clue WHAT they want... at least I've seen that a LOT...
Worrying about it won't fix anything... sounds like she needs some space. Either she'll come around again, or she won't. Probably the worst thing that can happen at this point is that in a few weeks she'll be back, and you'll THINK everything is cool again, and then a month or two or six later she'll do this sort of thing AGAIN.... for whatever reason. I've seen people go on this sort of merry-go-round a lot, with their feelings dragged through the mud every time, and take them back again... and again... and again... and get hurt again, and again, and again. Just something to keep in mind.
Like I said before, I dated a LOT of women before I found one with her head screwed on straight... and when I did, I married her as quick as I could... and even Betty, who's a very smart, practical, and down to Earth person, can drive me crazy with her emotionalism and indecisiveness at times... it's just a trait of the female half of the species...
Later and good luck. Remember, when God closes a door, another to a better destination opens... You just have to keep YOUR head screwed on straight and keep moving in the right direction, and you'll get there...
Best wishes! OL JR