[quote=@Guardian Angel Haruki]
<Snipped quote by rush99999>

I've run an annis hag in a different game and I have a similar villain in Wild Beyond the Witchlight (without giving spoilers). 

Fighting an Annis Hag, or any hag, is not the issue, as they are depicted to be irredeemable monsters.

The main issue with this encounter is fighting the child without the possibility of helping the child. 
[/quote]

I think this is the way I would have put it too. I have also fought one of these hags in previous games but we managed to help the children before anything bad could happen to them.