Geeeeeeeez! I am so sad to hear that! Minnie, you are a FAR nicer, better gal than me cuz I can assure you, if that were my MIL, my husband would have to drag me kicking and screaming from the house as I assaulted her with every nasty thought I'd harbored about her ill treatment of me!
I agree with another post - make your husband talk to her. Do not ask her to be more respectful of your problems, but demand it of her! There's no excuse for such blatant rudeness. If that doesn't work, then I'd go toe to toe with her myself, but that's just me. I thrive on constructive confrontation