Rok, we have made a significant "new" discovery. Although she has been around for quite some time, she's new to us in regard to her music; while if we had been on a quest for something new, as related to time, we would have discovered "zilch".
This recent experience explains so much more when I compare it to life in general. Just as we are going backwards in music, life in general for the working man is going backwards. While those who can afford "yachts" are trading up, we are trading down.
So much for economics. Now back to music; although Mary Lou was an extraordinarily gifted musician, she was a very common person who always thought of her brother and sister human beings, meaning she was not self centered.
Her legacy includes the Mary Lou Williams Foundation, which she established shortly before her death. The foundation helps children and young adults learn about jazz.
Enjoy the music.