I hope she wrote her memoirs.
She wrote two books: "Born to Fly" and "My God, it's a Woman!" The first is out of print and quite rare; the second easily obtainable. They're well worth reading. I have signed copies of both, and no, they aren't for sale!
Incidentally, she spelled her name "Nancy-Bird Walton" because she felt that since most of her flying had been done before she even met her husband, it was more appropriate for her to be known as Nancy Bird, and that seemed to her the best way of ensuring that happened. She was very insistent on that spelling.