I wrote "Gunnora's Gift" for Andre Norton, who asked me to write a story for a Witch World anthology she was editing. This story was actually written between "Sin Catenas" and "Golden Vanity"; it was one of the times when something gets written, submitted, and accepted, but doesn't get published for a few years. It used to take about a year from the time a book was turned in to the publisher to the time it was published. Publishing can be done much more quickly now that submissions are already in electronic form and don't have to be typeset from a paper manuscript.
"Gunnora's Gift" is available for Kindle and Nook.