Whenever anyone cheats on, and leaves, a good spouse, they almost always reach back out at some point after their life has spiraled down and hit rock bottom. You were the best thing that ever happened to her. She's looking for you to rescue her from her crappy post-D life. I've seen a lot of people who do. Some live happily ever after, some end up repeating the same thing that happened to them in the past.
That is what she's looking for. Her OM was a POS and has probably abused her, stole from her, and pretty much destroyed her. All her fault. She realizes what a gem you were and is fishing right now seeing if there's a chance. Is there?
