當時她已經不認識我的其他的同學和朋友了

Alzheimer disease對於現代醫學還是不治之症，最多也隻能減緩病情的惡化。2014年有一部電影"Still Alice"就是有關Alzheimer disease的故事，Julianne Moore因此獲得當年奧斯卡最佳女演員獎，值得一看。

google了一下：

Why is Alzheimer's disease so devastating?

"As the disease progresses, an individual loses his memory as well as mental and physical function — it is this function loss that leads ultimately to death. Once the disease starts, we are able to slow the progression with currently available medications — but we can't stop it or reverse it."