The tacked-on 'happy' ending showing that she was innocent is at odds with her admitting guilt during their prison meeting. Why would she say something this crushing to John if it was untrue? John happens to not believe her admission, but it's still an odd thing to say to your supportive husband if indeed it was untrue.
My view is that instead of living his life, John was obsessing over how to appeal his wife's verdict and somehow get the courts to see she was innocent. I believe she didn't want him to waste his life for what she believed was a futile cause. So, she pushed him away.
She said "Well, you'd be wrong" in order to get him to forget about her and leave her in there.
It's sort of like when men break up with their girlfriends and ask the wife to divorce them when they are in jail. Neither the incarcerated person nor the free person need to be emotionally connected and tortured by attachment to someone they can no longer have.
But fortunately for her, John believed in who she was so strongly, that he kept obsessing and broke her out.
That's the only reason I could think of.
They both committed extreme acts of love: she loved him enough to try to get him to abandon her in jail, and he loved her enough not to.
She was trying to give him an out. She had no reason to believe she wasn't going to spend the rest of her life in prison so she was doing what she could to make him move on with his life. Maybe go find a new "mom" for their son.
shareIt was not a tacked on 'Happy Ending'. It was quite clear within minutes of her telling him she had done the murder that she only did that to give him a way out - so that he would not continue obsessing about the situation - to free him from her - an act of love.
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