Right now there's absolutely no evidence of what her motive was and there are no news reports giving any solid facts. Hence, aside from the pleasures of mental masturbation, there's no reason at all to speculate on what caused her to do it.
Never fear, Micky Sherman is on Fox trashing both of them now.
The biggest concern I have with this case, is that we need to find out why a precious Mother of three, the pillar of the community, would feel the need to blow her husband away..
There WAS a reason...
BTW, I am thinking that she shot him in the BACK, because when she confronted him with the gun, he started to walk out. So she shot him then.
sw