I usually post on the fibromyalgia forum. My mom was diagnosed with Alzheimer's over six years ago. We have been playing this game with her that long, her refusal to take meds, etc. That is exactly what it is, a game and as frustrating as it is, you really can't blame them, it is the disease. It causes them to become so child-like yet if we treat them like children, they very much resent it. I realize you weren't asking me for this, you want an answer. I just felt compelled to write to let you know you are not alone in this frustration. My mom lived with me for only one year and I couldn't take it any longer, the stress was simply too much and my health really crashed. She went on to live with my sister for 3+ years and is now in assisted living, where she is really very happy, thank goodness!
I think what your mom is looking for is someone to play with, to tease and she's found it in you. This really pushes your buttons and that's what she wants, it is amusing her. Maybe try giving the medications and walking away? Not saying a word about whether she took them or not? I wonder if that would work? Believe me, I feel your frustration...good luck,