This is really a question for a neurologist but I will answer as best I can. In older people, small changes can have big effects if there is a fair degree of cerebral atherosclerosis, so yes, infection and fever and a lot of medications can tip the balance. That said, there is reason to be optimistic, so getting a physician to review and minimize her medications and treat her fever is the right thing to do.
It is not common to have an acute change in memory be the first symptom of Alzheimers.
anyone researching memory loss and other cognitive symptoms
in the elderly may want to check out LEWY BODY DISEASE
........ one family has documented their mother's decline and
has published an online journal....when I
read the excerpts, I could have written the comments myself....
esp. about the "identical houses" and concern about "getting
home"....(see journal entry #7. Dr Jekyll and Mrs. Hyde...)
sometimes this illness is misdiagnosed as Alzheimer's because
symptoms can be the same....however,there is more physical
complication with LEWY BODY Disease and the Rx treatment
may vary .......... my
Mom's memory loss happened rapidly over a 3 week period...
she appeared to be hallucinating at night...Generally she
would be fine during morning and early afternoon hours, but
become more agitated as day went on...and especially the
hallucinations or dreams, and wandering at night...this
is known as the "sundown" effect.......
I was amazed at this little known, but 2nd only to Alzheimer's in Seniors with Dementia.....HOPE THIS WILL HELP SOMEONE......
*D*