My Step Mom, 87, has symptoms of early dementia. She still live independently, but I check on her most days and take her to Dr. appointments, sort her pill and etc. Anytime we eat out, she comments on the people around her and that she recognizes them from the last time she was there (even if she has never been there before). Even driving from her apartment, she points out pedestrians as regulars. Early on, I would correct her, but now know not to and just let it slide. I have never seen this kind of dementia before. Any comments?
Now I know that anything she says must be checked out as to how real it is - mom would also take several partial memories & make a new one - fortunately on about the 3rd or 4th time, I witnessed what happened [my uncle's funeral] & quickly realized what she was saying didn't happen - she said my dad didn't go according to her memory but all 3 of us were there & she did a reading as part of service
Your step mom may know down deep her memory is getting bad so she may be trying to show you how good her memory is - much like someone who is drunk trying to show how sober they are - she may be worse than you know into dementia - have her seen by a doctor & contact that dr before & explain you concerns - this may get her help that she needs or at least give a proper diagnosis