She seems pretty fickle and more trouble than its worth.
I can't speak for all girls but I just know when I want to pursuit something and when I'm just not in to a guy. For me there is no gray. I'm either into him or I'm not. Sure, you can become friends and eventually find you have feelings for a friend but that doesn't happen too often, not to me anyway.
The only other thing I can think of is that her behavior had to do with the argument. Maybe it just turned her off or made her see you in a different way. Like I said, probably more drama than its worth worrying over.
So, so you think you can tell Heaven from Hell,
blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?
And did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
And did you exchange a walk on part in the war for a lead role in a cage?