She also had "No penicillin" on it (forgive the spelling). Perhaps she was allergic to it, and that is something that docs like to have on a medic alert bracelet (my mother has one). A lot of times people with "living wills" that specify no ventilators or recussitation would also have one. "No Code, DNR" means that they don't want to be "coded" -- heart defibed and such or resucitated (opened airways, ventilated). Basically, if her heart stopped and she stopped breathing, let her go. Sounds like something she'd have long before -- and if she were seriously ill.
She was also found near the area where babies and young children were buried. Does anyone think that perhaps she lost a baby/young child/young grandchild through code/vents and just couldn't handle it? Or sat through the pain for all those (possible) years and with a terminal illness diagnosed decided to end it all? A look at the graves around where she was found might give some details as well.