One day hasn’t erased a year on the road to freedom from the web an abuser spins around their victim.
Don’t think like that.
She has learnt lots, gained self confidence and probably the skills to see abuse both quicker and clearer.
She might seem to be looping back to the beginning. But she is not. It’s a long and winding road she’s on, not the motorway you’d hoped for.
You don’t know how this will pan out and are leaping to worst case scenarios, which is understandable but extreme in your disappointment and anger.
She may well believe the huff he’s fed her and Christmas is such an emotive and vulnerable time.
But it’s inevitable the shiny promises will turn into the usual abuse, and when that happens she may well react stronger and faster than before due to her development over this past year.
It may even be a moment of weakness when caught up in that Hollywood Christmas togetherness fairyland. And the scales may fall from her eyes by new year.
I’d make it clear that you cannot support her in going back to this man, but keep the anger and the black and white thinking to yourself. Aim for neutral and say she’ll be welcome when she can find her way out of the fog and misplaced hope. And then leave it for a while... and feel free to rant away from her!
But if you tell her / give her the impression that she’s failed and betrayed you/ herself/ dc etc, or that she’s ungrateful as everyone’s efforts mean nothing now etc... well, that kind of all or nothing thinking plays into her abusers hands, and also if she believes that she’s failed/ burnt all her bridges / can never return from this terrible mistake etc, then she has a million reasons to stop believing in herself, or the hope of a better life. If she believes she’s fucked it all up completely then in her head she has to stay as her support network will judge her and cut her off, so the only person she can turn to is the abusive partner.