What actually happened though, is Kay Corleone told her husband that she had an abortion and that she intended to leave him and take their son with her for his safety and his future.
Which under the context of both films should have had her in a pine box. Betrayal is a capital crime (ask Fredo). She knew since she first showed up at Connie's wedding. C'mon, Johnny Fontane is showing up to sing at wedding for some Olive Oil tycoon from the Lower East Side? (I know I am over simplifying things) She was a Disloyal Fool ass bitch made punk. I take umbrage with her lack of loyalty under the guise of finding enlightenment years after living high off the hog with the spoils of war in Lake Tahoe.