I would say she is. She allowed this situation to happen, She allowed black cock in her destroyed body , she allowed April to move in the bedroom , She allowed cocaine to be accessible to her kids , She allowed Nick to run wild with no repercussions.
Be it not for her lack of intervention Nick might have sobered up in " Sober January"
She could have jerked Nicks chain years ago and hasn't. She knows if he dies she is free and has a great life insurance check to collect.
IF I was Nick I'd be worried about her putting eye drops in his sweet tea.