Why do people keep saying this, she needs to take accountability for the fact that she chose to stay with him, marry him and bring a kid into the world, why would you do that if your partner is an abuser?
I really don't want to here about Stockholm Syndrome, her motivation is clearly money and security (ironically)
They both deserve each other as far as I'm concerned.
I've dealt with loads of domestics and the partner wanting to stay is extremely common and I find it weird you think you know her motivations based on very little. Partners stay because of fear, often because they're told they won't find anybody else/aren't good enough/nobody will touch you again, or because the partner has managed to gain control of every part of their life and that can be terrifying to walk away from. There's actually a crime for that called control & coercion. Abusive partners aren't just physical, they destroy the abused partners self-esteem and sense of individuality.
You don't know. Don't pretend you do.