I'm sure this has been discussed, but it's really weird how much MT tried to pattern herself after JdF, whom she could never match in any way. The hair straightened and dyed to approximate her look. Her seething jealousy clearly inflamed this situation. She didn't just want JdF's husband, she wanted her life-- her house, her kids' school, her territory, her whole being. That disgusting comment she made about how she was cleaning the house not Jennifer-- a very telling slip. And her barely-contained rage, as has been noted, when she discovered her little paramo had lied about where he visited the children. She's a pretty horrible piece of work and I'm glad yellow is the new orange, it brings out her sallow expression.