Point well taken, but we're talking about a long drive (lots of time to reflect) and a modus operandi that was just moronic - really laughable, except it seems she was angry enough to kill the "other woman" (whether or not that was her overall intent). Whatever ... her life wasn't going according to HER plan, and she didn't have the emotional tools to handle it properly. "Stupid is as stupid does".

This is all IMHO, of course. Never met the woman (and don't want to) and I'm not a shrink.