It's after Nina's song got sent to the star's management, who said they loved what she'd written.
"Apparently she (Rihanna) said it was beautiful and it gave me a confidence boost. It made me think, 'Maybe I'm alright at this after all.'"
Nina is now back with her first full album in three years.
In that time she's changed record label and has spent a lot of time "hiding away in a little cave in a little studio" like a "gremlin".