This is the thing. Have things gone too far to remedy? I had a friend whose relationship break down trajectory reminds me of Alice's. She too was in a 20+ year relationship and her partner left her for similar reasons to Ioan. From the outside, he seemed browbeaten and abused. He also had to go to court to get access, as she refused to let him see the children on spurious grounds.
Their two children later stopped seeing him in defiance of the court ordered custody arrangement, so he went back to the courts to have access reinstated. Social services prepared reports for the court, and the reports made it clear that they believed she was entirely to blame for the complete breakdown of the children's relationship with their father. There were recommendations for supervised contact in contact centres to try to restore the relationship. However, in court, the judge decided not to make an order restoring contact despite him accepting that there had been PA. Essentially he said that it wouldn't be possible to force the children to see their father if they didn't want to because of their ages (they were 14 and 12 at the time).
So her PA has been successful, and ultimately has gone unpunished. And the children no longer have a relationship with their father. I know that this is in the UK, but sadly, I think that something similar will happen here. Like in my ex-friend's case though, when the children grow-up they will be able to see that their father tried his best to fight for them. I can't even begin to describe the contempt that I have for Alice. Putting her own hurt feelings above what's best for her children. She's a monster. I've said this before, but I'll say it again - I honestly don't know how she sleeps at night.