Sure, I suppose thats possible but did/does she have any kind of training that would give here that skill? And though its possible, it still sounds rather far fetched to me.
Having been choked hundreds of time, by hundreds of opponents ive never gone down that fast, and every one of my opponents were stronger than the average 135 pound woman. The physical upper ody strength alone i would think would be enough to simply power out of any grappling move she could have put on him, unless it was the suggested "Love Strangle" in which case he probably put up no fight at all
Then again, Ive noticed that on the brink of unconsciousness, I personally become more aggressive, in an effort to not "go under".
Strange either way