Thanks everyone for replying and thanks for the links to those articles Storm. I'm printing them out and giving them to her doctor when I take her for her next appointment. Unfortunately because of the type of insurance she has we are limited as to the pool of doctors from which we can choose. In fact all of the doctors work at the same local clinic. I hate the local medical establishment.
I also had my mother read over that information. She's a nurse with nearly 40 years of experience and after reading those articles she has now launched into more research on the subject. Although she believes cannabis may be beneficial for my grandmother thanks to those articles, she wants to do a lot more research and consult with some Alzheimer's specialists at her hospital and see what they have to say before moving forward with my idea. She knows she won't get a straight answer from my granny's doc so she's taking her medical records and getting a second opinion. Thanks again, and keep your fingers crossed for my grandmother.