Even if you got an apology, that will NOT fix the whole drama of the relationships and negative family dynamics.
You don't have to fix everything.
Your Husband does not have a good relationship with his Stepmom. Only a miracle will probably change that.
What is is.
Meaning, an apology from her to you, will not fix things and it will not make things all better. Because, having other problems will be inevitable. Even if you do get an apology.
I know a couple of people, who for YEARS, will not interact with certain family members, because they never got an apology from their "enemy" relative. So just because they never got an apology, the family never gets along. Sometimes, a person doesn't want to get along anyway, because the other relative is so toxic. So that is their decision and that can be the only choice in a toxic situation. And they are standing their ground, based on they never got an apology. But realize, that MANY people, even if they are wrong and know they are wrong... they will NEVER EVER, apologize. They are not capable of that act.
Ever. So waiting for an apology in that situation, you will be waiting for an apology all your life. Because it will not happen.
Some people just do not have the ability to realize that they are even, wrong.
Don't hang your hat, on hoping she will apologize.
Its a waste of time. And it will only cause you deeper frustrations.
You are all moving anyway.
You invited MIL and FIL. That's fair protocol.
Just play nice and visit. Unless you and you Husband don't want to do that. Then just don't visit. And that is your right to do so too. Since MIL seems to toxic.