I've had similar from my MIL, along with a DH would never stand up to her.
We reached breaking point. I told him I couldn't take it anymore, so he had to decide whether he wanted our marriage or his mother, as there wasn't room for her in our marriage. He chose me*. We went NC with his mother, thinking that a bit of time would help and then it would all work out in the future, but she just doubled down, playing the victim to everyone, turned the whole family against her son, she was truly vicious, so we stayed NC.
*I had had no issue with his mother prior to her giving us a list of my inadequacies. From that point, she meddled in everything, tried to stop our wedding, all the while massively controlling her son (my soon to be DH). DH had no idea what a raving lunatic she was.
Her crazy behaviour was destroying our mental health and our marriage, hence why we put a stop to it with going NC. It was years later, once we reconciled with others in the family, that we found out how truly deranged she was, the lies she'd told others about us, it was utterly shocking. She's a sad lonely old woman now, but still the same woman.
@DoneWithMIL sorry to blether on, but women like your/my MIL will never change, they thrive on being Queen Bee and in control. Your only way to break free is for DH to come out of her spell, and start having your back. Even then, it might not improve matters, leaving NC as your only remaining option. Your DH needs to wake up and start supporting you, otherwise, he's just enabling her controlling behaviour.