I think it's quite realistic. In other isekais the MC grows a backbone and that is enough for the abusers to stop. Like she just answers back and everyone stays in shock not doing anything. IRL even if you drop the baddest line ever, if abusers have power over you, they won't stop. She is being rightfully careful. She stopped her mother in law from hitting her and ended up on an attic, locked up and humiliated.
Not really, because if her husband knows he will be treating her even worse than it appears at the moment.
I know what you mean with "irl situation" but in this case I do not thing her expressions manage to capture somebody who is restraining herself long enough. She blurted everything after her mother was mentioned XD
Still, it looks interesting, following!
I know it’s only been 6 chapters but this is her second life and she still lets this shit happen?