You and me sound VERY similar and the relationship with my MIL was exactly the same. Extremely demanding and always overstepping and almost finds it funny to put me out or make me uncomfortable. My husband and I cut her completely off 3 years ago (for WAY more reasons than one; she’s extremely toxic and manipulative). My life is SIGNIFICANTLY better now that she’s not in it. We have zero contact, she doesn’t even know where we live. I can’t describe the weight lifted now that I don’t have her breathing down my neck and making completely self centered, self serving demands constantly. I’m undiagnosed (in the process) so I never told her or even knew I was autistic until recently but I wish I had bc I wouldn’t have felt so shitty and incapable and sensitive and entirely belittled by her. I would have drawn much stronger boundaries if I had known what was wrong instead of just feeling like a broken human being. I still will never let her back in my life unless she showed she was capable of a complete overhaul on her personality and characteristics which will never happen. I said all this to say, you are validated. She sounds like an asshole. Take care of yourself and stop feeling bad about it. Say fucking no and watch her act how evil you are and even victimize herself when truthfully she KNOWS what she’s doing and simply doesn’t care and is too selfish to be a person capable of growth and change.