Good point. I have a friend here in Florida (where this type of so-called religion is also very common) who was married to a minister, who used to lock her in a closet to "discipline" her. She has a pretty voice, but he forbade her to sing in church because she might get "vain." Her life was a minefield of restrictions and forbidden things, harmless or good things that were forbidden by her husband, that is.
And his family was 100% on his side, since, naturally, this was where he had learned that women are creatures who need to be trained by being shoved into the hall closet and padlocked in. I'm sure that you're right, and that the in-laws, who obviously knew what was going on in that household, contributed a lot to this awful scenario.