Thanks guys, that's kinda what I figured. I don't know why she'd think she has any legal standing here, which is why I think she might have some other intent.
This was on 285 northbound at the Santa Fe exit. She was speeding and pulled an illegal and potentially dangerous maneuver crossing over the triangle formed by the white lines that mark the curve of the exit and the right lane that continues straight... just like any highway exit... and attempted to cut me off to get back into the flow of traffic. I simply didn't move (slam on my brakes) to let her in... in no way did *I* cut *her* off.
I have no reason or intent to modify my OP to say anything other than originally stated. If you think I'm in the wrong here, you probably drive like a douchebag too.