Mother with Alzheimer's won't take pills. Any advice?

She is on an anti-depressant, Namenda, and Ativan, plus a few other pills/vitamins. She takes these in the morning. I go over every morning before work but she can be incredibly slow and if I wait around to make sure she takes them, I am late for work, sometimes up to an hour late. And she won't listen or take them for my dad. Once or twice she has even hid them. She questions every pill, what it is what it is for, and argues about the number of pills she takes. She is getting very belligerent about it. At night she takes Namenda and Zyprexa. Once she started refusing to take her evening pills, we started crushing them and mixing in her food. She eats cereal for breakfast, so that's not an option in the morning. I don't know how to handle this. She has been doing better most days since we got her on this regimen, but I'm afraid if she goes off them we will have a real battle on our hands again. Her and my dad still live at home. We take them supper and do the housework and have someone with them a few afternoons and every evening. All family members, and we are all stressed out and exhausted. Dad has declined having someone come in on a regular basis, he knows mom will fight it and blame him. How can I help or do more? We are fresh out of ideas!