Sounds like she transferred her guilt about the cheating onto you.
The mixture of Drink and mental health problems are absolutely horric.
Her reality is possibly very warped, almost surreal in comparison to your reality and memories.
It's probably better you keep a protective boundary around yourself as it's not uncommon for abusers in this sense to try and draw their victims back.
She has no one to lash out at and no one to blame while your not there and she may find this quite difficult.

Only you can judge how genuine her behaviour is. Or wether it's another form of manipulation. If your aware enough you could test it out.

But if your just getting yourself on your feet after years of emotional abuse, perhaps focus on getting stable and leave her to find another whipping post.

Take care, all the best.