There are a lot of cool Ella Fitzgerald interviews archived at NPR.
No kidding! I'm going to check some of those out. When were they made?
I'm not sure about the year that they were recorded but the articles and interviews were released pretty recently, in 2013 and 2017.
That's so cool. I always got the impression that she was a very deep and thoughtful lady. What was her best selling album?
Her most appreciated/most loved album was Ella Fitzgerald The Cole Porter Song Book. 
Ah yes that's a great album! Didn't she make an album with Duke Ellington?
That's true they made the live album Ella and Duke at the Cote D'Azur.
I don't think I have that one. I'll search for it on Spotify. When did Ella give her last concert?
She gave here final performance in 1991 at Carnegie Hall in NYC.
Wow, that was before I was born. What I would give to have been there!