Has she been brainwashed?
Yes. That is how abuse works.
And quite frankly, the professional advice is not to tell someone being abused to leave because it will push them further away from you and make them less likely to leave. Five minutes reading the Women's Aid website explains this.
You don't help an abused person to leave by commanding them to leave and pushing your viewpoint on them - just like their abuser - you do it by helping them to see the abuse for themselves, to understand it by themselves, and to reach their own conclusions and make their own decisions. Free of your coercion and free of their abuser's coercion.
This is why the Freedom Programme make it so clear they will never tell a woman to leave. It must be her choice, and she can only make that choice with information.
If she grew up witnessing financial abuse and having it normalised of course she won't see her husband's behaviour as abusive. I'd be more shocked if she did! Repeatedly telling her to leave him will just make her more determined to find ways to "make it work". It's the same trap everyone who is abused gets stuck in.
She's not going to see it as abuse. Of course she's going to defend somebody she loves and who she believes loves her.
Wouldn't you defend your husband if somebody said he was abusive when what you saw was a loving man who was kind and good natured but sometimes a bit tight?
Wouldn't you tell somebody no if they told you to leave your husband because they didn't like something he'd done that you thought was pretty average?
Come off it. It's a bit rich of people on this thread to expect somebody being abused to have a crystal clear understanding of the dynamics of abuse when they themselves are illustrating they don't understand it at all.
Oh, and of course, no abusive man has ever used pregnancy as a way to maintain control over a woman... and she just got herself pregnant all by herself. 