This might seem overkill but this is keeping your mental sanity and safety in place. You don’t want to get married into these kind of families. If she stayed silent once, you will not know if she will stand by you next time, by then it might be too late.
Run. RUN FOR YOUR SAFETY.
I have a toxic family, I’ve stood up for my partner at every turn. You don’t let your family bully the person you love. Clearly she loves her family more than you.