I didn't know Nana M had recorded "Why Worry".
In the summer of 1980, Dylan wrote "Every Grain of Sand" and, soon after, recorded a demo of it, apparently so that he could send it to her and get her to do it - which she did, I understand. The two of them had met during the course of Dylan's 1978 tour. Anyway, the interesting thing to Dylan collectors is that the demo and her version had a slightly different lyric from Dylan's later recording.
She was reasonably successful in Britain in the early 1970s - she had a TV series here for quite a few years, on the back of which she had a fair amount of success in the album charts, too. She's not really my cup of tea, I'm afraid, but somebody must have liked her. Coincidentally, Demis Roussos was successful here in broadly the same sort of time period. Again, not my cup of tea but there it goes ...