I know I tell anecdotes over and over, and that there must be plenty of people who've heard them more than once. I sometimes borrow (with credit to the original teller) stories I've heard from others... Including a few off here.... My Mum often repeats stuff she tells me, and my gran did the same. Comes to us all I expect.
It'll be nice to try and prompt some new memories Longers, but I wonder how much she's retelling those tales because she's comfortable in them, and it gives her a secure feeling - so perhaps don't steer her away too completely. I remember a while back hearing a programme about people with dementia, and someone saying that sometimes it's better to let the person live in their 'wrong' idea about something, than challenge it and make them realise they have got it wrong - the example was a lady who took her Mum to the doctors, and the old lady thought they were in an airport boarding lounge and asked where they were going. It was kinder, and less stressful for everyone, to play along a bit, than keep saying no, we're at the doctors. Once in with the doctor, the lady was ok with it because it was clear what was going on, and she'd forgotten the airport idea. Sounded very humane and obvious the way they described it, but it must be hard not to say "No...." all the time, because you'd want the person to right, not wrong.