I learned about her when I worked at Amoeba’s Hollywood store. As I recall, her records didn’t sell and she became a dental technician. One of those artists who’s records are scarcer as commercial copies than as promo copies because she sold so poorly.
She's one of the wonderful undiscovered singer/songwriters of her time, along with Karen Dalton. Each is worth exploring regarding their music. I know Dylan has praised Dalton. I've no idea what he may have regarding Sills.