I'm glad you have your Mom's support in this, it will make it a lot easier! I have put in a few articles that are readable-
pain - http://www.news.net/print_article.asp?id=17995
arthritis (and more)- http://ccrmg.org/journal/04spr/conditions.html
sleep modulation - http://marijuana.researchtoday.net/archive/3/8/
arthritis- http://bentham.org/ctmc/contabs/ctmc6-13.htm#8

If you need more, just run a search on cannabis arthritis and you will get more than you need! NORML and EROWID both have a lot of info. I'm a medical user in California and I'm 59. Once you convince Oma to try it in a brownie, think seriously about getting her a vaporizer (the little Vapor Brothers types are nice and not TOO expensive). She doesn't need to mess her lungs up and too many brownies put on the pounds! By the way, vaped cannabis can be reused in brownies- recycling at its best! - Granny Storm Crow :stoned: