Helen already knows he is an emotionally abusive, wife beating rapist. She does not need someone else's permission to leave
I don't agree. Helen doesn't yet think of him as abusive. She explains away / justifies most of his behaviour as being her own fault, because she was out of control , it's for her own good, he just does it because he loves her and wants to protect her / the baby .
She doesn't yet think of him as a rapist . She probably thinks that she wasn't clear enough about what she wanted, that he was swept away by passion, that men can't stop themselves etc . There's enough people out there who will justify a man raping a stranger or a causal acquaintance - they could not accept it could be rape to have sex with your Gf or wife .
Many many people seem to think that if you consent once to sex with a man , you have consented to anything , any time , forever . Helen may be one of them , although you can see she is starting to change her mind after the conversation with the woman on the helpline .
She is upset about it but she can hardly articulate why. She has a bit to go before she is able to acknowledge to herself that her husband raped her.