I feel like this is another one from the 'you just wouldn't believe it' files.
I also think it's part of the deal for a lot of mlc-ers and their OWs.
They seem to need to show themselves to us as a way of making it seem like 'everything is normal' - that what they have done is OK and right.
In my case, my local supermarket (where I did all my day-to-day shopping) was taken over by OW (who had NEVER shopped there before), as was my local coffee place (again, she'd never been there before).
Luckily, I had the option of just going elsewhere. But then she started showing up at my new supermarket ... but that's another story.
What i think is going on is that they WANT us to see them. In my case, to provoke confrontation, so that they can confirm what a bi-ch we really are.
They need this confirmation.
I fed into this for a while... but, now, I just feel sorry for both XH and OW. What a sad pair of truly inadequate human beings they are.
Could it help at all if you took on this mind-set?
How awful that she is doing what she is doing. How weird that she is not ashamed of herself. What sort of person would do what she has done?
Just try to think of her as the damaged goods that she is. If you run across her, feel pity.
Either she knows what she has done and how wrong it is... or she simply has no clue whatsoever. Either way, this is pretty sad state to live one's life in.