Thanks guys. She hadn't been mentally there for a while, unable to communicate, and just simply started refusing food and liquids late last week. She slipping into an "unresponsive" state last weekend. So thankfully unlike cancer (sorry to hear that I2K) it was probably very easy and painless for her. It had seemed in her increasingly rare lucid moments that a spark of her was there, but trapped in a failing body like a prison, so in a certain guilty way I think it is best this happened. A nightmare ending, I now think, is to be trapped in a body that is unable to express what mentality is left.