Believe NOTHING she says, and I mean NOTHING. She is in a wayward mindset and has rewritten history in her mind to justify her actions. Think of her as a victim of alien abduction and this is a pod person. My WH said the exact.same.things. Over and over again he would tell me how awful our marriage was, how there was no redeemable qualities about me, how he just "needed to take care of himself." He swore he never was in love with me, despite the humongous leap he took going against his family to marry me. (we are from different cultures) I swear they have a book downloaded into their heads when they pull this junk.
The good news is she will one day realize how incredibly stupid and destructive she is behaving. The trick is not to get sucked into her whirlpool and protect yourself and child while she goes down this road. Please, as someone who put waaay too much in my own WH's words when he was doing a lot of the same awfulness, DETACH. You are doing a fantastic job and this is a marathon. Please continue to surround yourself with loving and supportive people. Do not let yourself be alone too much, don't try to analyze every expression or word that she shows, most likely she will later not even remember half of what she has done.
M 10yrs T 13yrs BD #1Oct 2015-PA between WAH and COW BD #2 April 2016-WH resumed PA, she broke it off Jan 2 2017 WH says he wants divorce April '17-Letting go 2018 D busted DD8, DS6, DS3