If you killed your child by accident, wouldn't you be in mourning instead of going out to the club and entering hot body contests like she did when her daughter was supposedly "missing"?
You bet your life I would.
The defendant may be a psychotic narcissistic ****. I actually "get" the thrust of your question and kind of presume that your instinct about her is pretty accurate.
But that doesn't change the question.
Does anybody deserve a death penalty over an accidental homicide?
If the honest answer to that is "no," then I believe that her hideous narcissism after the accident doesn't change that conclusion. (It just makes us kind of react to her with greater disdain.)