One doctor after another dismissed her complaints. Until recently, since she was, at age 62, functioning well and having no trouble taking care of herself, that might have been the end of her quest for an explanation.
Interesting article about those who have been studying the genes and markers that may indicate if one will develop Alzheimer's and the moral dilemma it brings up...
The article is on NY Times, you can click the link to read the whole article. If you are not already a subscriber you can now do so for free!