Good to see you are still in there fighting. I know it's difficult. You are a special man for what you are doing for your W and family.
I can't add much to the great advice you have already gotten. I just want to emphasize that you MUST refrain from the R talk and stay focused and detach. W will be looking to validate her actions and reasons by your reactions. She will bate you consciously and unconsciously into proving her case that YOU cannot and will not change. I've been there. XW still talks about things that I know are not true. She is doing all she can to still reinforce her decision. You just have to let go. Don't fight it...You can't. Unless you have video evidence she will never believe you. I don't doubt that she told her sister about hiding the money but in her state she will truly believe that is not true. I had my share of conversations that never took place or things that she never said to friends or family.
I'll also pray for you Bro. This has been one long journey and a great test of faith for you. As I wrote above...You ARE a special man.
I am the man who is loving my kids and will keep them from continuing this cycle of destruction.