IMO the things TN has said regarding Misty's motherly role, could have been said, not to denigrate CS in any way, but rather to speak to her opinion of Misty's treatment/interaction with the children in a way people would understand. One can choose to think it's a put down or one can choose not to. We don't know what was in TN's head when she said those things.
I am a stepmother, I fulfilled a motherly role, I was like a mother to them, I loved them like a mother, they wanted me to marry their father and be "a mother" to them, none of that however has anything to do with their own, biological mother, just a way to describe the way I treated them and the way they viewed me. It doesn't indicate or imply their biological mother didn't do the same and more or elevate me to the status of their "birth mother". It's just a way of describing the situation that people understand.
I am sure if TN wanted to do be "cruel" to CS, there are more, concrete, factual ways she could go about doing that it she so desired.
