On Stevie's writing, I think a journey through what we know is still in the vault shows that yes, she was writing fantastic melodies and lyrics: The Rhiannon songs, China Doll, Sanctuary etc. There is an old review out there somewhere of Buckingham Nicks that makes note of her skill in combining chords and melody. This is true of her writing (even pre-73 to 84) noting she had some good songs pre Rock a Little production. A combination of drug use and inflated sense of "everything I write is a classic", lead to the sharp decline in quality and consistency.
So, I believe I Don't Want to Know is hers but with a lot of Lindsey input to hone it into a fantastic song. Nothing different from Dreams or Gold Dust Woman and later Gypsy and Straight Back.
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