I think she was just fed up.. She went from being a calm women who just wanted a happy marriage and a family of her own to not caring about anyone but her self to a cold and dark women. She was tired of all the things in her life she held in her heart being ripped away. Sunny, Vito, Carlo, Antonio( mother), Fredo and even Michael who accepted being godfather to her kid and than killing her husband the same day. not to mention all her marriages failed as well. I only watched the third movie a dozen times because I thought it was a poor written movie. But that is what I saw in her.

I always thought that each son took one of Vito's strengths, but Connie showed them all.

Sunny- was strong and always willing to jump into a fight thinking it would solve the problem.
(Connie GFIII)

Michael- was smart and just wants things done his way or no way and looks out for his best interest.
(Connie GFII)

Fredo-he was gentle, emotional and wanted to take the safe way out but still sacrificed anything to be involved. (Even being a traitor)
(Connie GFI)


I will probably get negative responses from this but it’s just my opinion.