Just wondering - what answer could she possibly give that would satisfy? Do you think she's gonna come right out and admit "Yeah, I just wanted him and I didn't give a damn that you were pregnant?". Because, let's face it, whatever lies he told her in the beginning, there was definitely some point at which she had to realize some of the truth.

If she gives you a BS answer, are you going to be able to maintain your current hard-won equanimity with her? Will it benefit your daughter if you start to rage against creepy OW? Do you have any power to change things if it turns out she's a total creep who doesn't have the decency to say "yeah, my bad"?