I have no clue who she is.
She was probably the most popular American female singer of the 1970s. She was also California Governor Jerry Brown's lover.
One of her later songs...
December 23, 1989 reached #2
DON’T KNOW MUCH - LINDA RONSTADT (featuring AARON NEVILLE)
https://www.youtube.com/watch?v=WmuJ0us63GQ