If she is the whack job maybe HE was going to leave and take the daughters with him! I interviewed for temps a couple of years ago so I could go on vacation and one of the women who interviewed started with she was bipolar! I thought what a great way to eliminate someone for hiring! Like it's something to announce like you won a prize! Ha!
Seems like I heard post-partum depression on one of the shows last night. That may have been guests speculating, though.
I spose that is possible, (that she was involved with another) but think it improbable because of having a 1 year old....
And, whatever the reason, murder is never excusable. There are other ways to resolve these problems... but who knows what kinds of pressure she was under, and she may have snapped.