"Midsummer Folly" was written for the anthology IN CELEBRATION OF LAMMAS NIGHT, published in 1996. It started with a song called "Lammas Night" written by Mercedes Lackey, and each contributor to the anthology wrote a story based on the song. It was fun, because the song set up the basic conditions of the story but ended just as the heroine had to choose which of two spells to use. Lammas is a pagan festival midway between the summer solstice and the fall equinox, hence the "Midsummer" part of my story title.
"Midsummer Folly" is available for Kindle and Nook.