But those expecting the singer to entertain them with a song may have been disappointed as she didn't have her guitar with her.
Instead Mrs Grant brought an album, a Christmas CD and a DVD for the rest home, and a bouquet of flowers just for Mrs Iles.
"She's lovely, she's a darling," Mrs Grant said of Mrs Iles.
The singer said she got asked to go to all sorts of places, but picked and choose the ones she went too.
Mrs Iles said it was a surprise to meet the Scottish singer, who she has been a fan of "for a long time", since she first came on stage.
"She's very nice."
Mrs Iles has most of Mrs Grant's albums, and has been to see her in concert.
Her granddaughter Lorraine Douglass was also there to meet the singer.
She said Mrs Grant was one of Mrs Iles favourite singers and her grandmother really enjoyed the chance to meet her.
"There was a big smile on her face when Isla walked in."
Mrs Houston said the rest home was lucky and privileged that Mrs Grant came along.
She said Mrs Grant's music and DVD are often played in the rest home.
"For Nellie to have that memory and for her granddaughter to share the memory with her, it's lovely."