The general consensus is that Aretha Franklin was the 'queen of soul' She was very good but nowhere near as good as Mavis Staples, but that is just my opinion for what it is worth.
Mavis rose to fame as a member of her family's band The Staple Singers (she is the last surviving member of that band). During her time in the group, she recorded the hit singles "I'll Take You There" and "Let's Do It Again". In 1969, Staples released her self-titled debut solo album.
Staples was inducted into the Rock and Roll Hall of Fame in 1999, named one of the '100 Greatest Singers of all Time' by Rolling Stone in 2008; and enrolled in the Gospel Music Hall of Fame in 2018, as a member of The Staple Singers.