As I said in a previous thread, while I don't find Bundy to be "cold" in the least, she is more brazen than she is bubbly (which is probably an intentional choice to separate herself from the Witherspoon incarnation in the film.)
This character needs to be larger than life, and I don't think Laura has quite hit that yet. If she made things a bit bigger and loosened up a bit she'd wind up with a more winning portrayal (though she's in a good place as it is.)
Tonya Pinkins: Then we had a "Lot's Wife" last June that was my personal favorite. I'm still trying to get them to let me sing it at some performance where we get to sing an excerpt that's gone.
Tony Kushner: You can sing it at my funeral.