Your mom should have a good primary care doctor.
Especially if your mom is a super-grumpy, help-refusing, know-it-all who doesn't like to listen to anyone, least of all her good primary care doctor.
Especially if all your mom does is complain about how much it costs ($10) to come see her good primary care doctor 4 times a year, or how much of a pain it is to have to call to order her free medications from the clinic.
And especially if you and your mom don't get along great, probably because you're too much alike.
Because, if your mom's good primary care doctor has a good nurse who is used to getting yelled at by your mom, she'll notice when your mom is a little less cantankerous than usual. She'll point it out to your mom's good primary care doctor, who will take a little more time than usual questioning and examining your mom, and who will have the appropriate level of concern when your mom is 2 months off of the date and thinks the president is Carter. They'll also notice that she's slurring her speech, but just barely. Because they know your mom pretty well.
So make sure your mom has a good primary care doctor. And make sure that she has a good nurse.