Diane said, she "stopped for the light right in front of her car."

To me, that implied the car was already there when she stopped in front of it.

What she meant was that she stopped at the light, then the car stopped behind her.

I'm still unclear as to what happened when the light turned green. If Diane was stopped in front of the car, how did she observe the driver make all the mistakes if they happened behind her? If the driver passed Diane, how did she do that without hitting her if she was oblivious to her. If Diane moved out of the way to the right to let her pass when the light turned green, that would explain much, because motorists often act as if cyclists are not there as soon as the cyclist defers to the motorist.