I guess she may be having trouble handling the fact that she made a decision that has consequences?
Accountability is a walkaway/wayward wife’s kryptonite.
They will do anything and everything in their power to change narratives and control people’s opinion of them.
Don’t waste your time thinking about it. It’s very simple - she made comments behind your sister’s back, but accidentally sent them to the wrong person. End of discussion. It is what it is.
Quote
It will likely be many, many years before she sees all the consequences paly themselves out.
Even if she does realise the consequences in 5-10 years, she will still never admit it. To hold out for that or think you’re going to get some sort of closure or vindication from it is a fool’s errand.