Actually, I was referring to the perspective that WA repeatedly blurting out the hitman allegations are a strong indication of her not having been directly involved.
I can only speak for myself, but if I was conspiring with my brother to have my ex murdered by a hitman, I wouldn't ever use the word 'hitman' in conversation, and never in connection with my brother planning to hire one to kill my ex, and most certainly not to police. I think that's just human nature, to cover up if you have a guilty conscience. The idea that she was deliberately letting it slip, in order to somehow frame her brother doesn't make sense. For one thing, she doesn't want her brother to get caught, and for another, if he was caught, so could she.
It seems to me a quite simple thing for DA to know, from Wendi, when DM was in town, and to know that they each took the kids to school early. The hitmen were told to wait at his home, follow him to the daycare to ensure he dropped them off, then follow him throughout the day until they had an opportunity to kill him. They could have followed him for hours. Why would Wendi know what specifically he was planning to do that day?
Maybe she drove near her old home because that's the route she knew from having lived there a long time, and had never bothered to learn alternate routes. Maybe she went to the liquor store closer to her old home because that was the one she was used to going to, and liked.
I think it's quite possible she had what people on this board call a 'spidey sense', or 'hinky metre' going off about something going on, but I don't think she was consciously aware of the plot. I think she's extremely loyal to her family and is playing Hear no evil, See no evil.