Advice on dementia?

we are getting worried that my nan has dementia - she phones up to 10 times a day asking the same questions about where me, my mum and my dad are living (as we all live separately) and keeps asking me where I work, she forgets things she was told minutes ago but can remember things from the distant past. Her local vicar rang us a few weeks ago to say he has found her wandering around the village as she had forgetten where she was going. We have taken her to her GP and they arranged an old age psychologist who specialises in memory to see her. They gave her a 30 question test and said she scored quite well on it, and said she may have mild dementia but they weren't going to take it any further. Since my grandad died she can't deal with her bills and stuff as she never has done, so we are doing them, but basically she can take care of herself and goes to see her friends locally etc - any advice on what we should do next would be very much appreciated.