While I can't scope your situation entirely, to me, these are all indicators that she is losing or has lost interest.
You might be of the mind to continue to chase after her affection, which is likely to drive her even further away.
The other option is to admit to her that you've noticed the sharp change in behavior and suggest that you part ways or take a break.
It's going to be tough. It's going to seem a hell of a lot tougher; but is it going to be much worse than having to constantly worry over the above?
To curb the breakup pangs, go out and meet some other women or get into some other activities to take your mind off of her.
After a while, the world will look fresh again and full of possibility. See it with these eyes and you'll most likely encounter another girl within a short period of time.
~Sphinx
You don't need eyes to see, you need vision. ~Faithless, Reverence.