Tad, The only reason that I can come up w/is that she feels very safe now in contacting you and your family members because she has remarried and there are now no expectations for you to think about. Some of them do settle down after a divorce and remarriage and want to be friends. They really don't realize the destruction that they have left behind. Their empathy chip is broken and they can't understand how much pain they have created for us.
Tad, the best thing you can do is tune out whatever you are hearing the best you can. Your sons need to step bringing home the information. They need to be told that it's not helping you recover form this ordeal. It's time they leave that information at the door when they come home. I certainly hope that they are not telling her what you are doing as it is none of her business any longer.
Tad, please, please, keep the focus on you and your family...but most importantly your mother.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.