I'm not saying it's the same, but if she's running a business, lots to remember, she might just not be concentrating, like me she might have too much on her plate. I am still working full-time and older than your mum, and sometimes I think I am in brain overload, with everything I have to keep a handle on for work - if I don't write things down, I forget them altogether, and forgetting people's names is awful. I use the wrong words for things sometimes - similar, but I struggle to find the right one, just for a minute. Your mum may not be the same at all, it's worth getting her to see her GP just for a checkup.