Part 1 of story.
Part 2 of story.
Story takes place on Wendy's birthday. (Probably the day the Witch Sisters adopted her.)
While the earliest indexed instance of this story appears in Chic Young's Dagwood Comics (Harvey, 1950 series) #134, cover dated October 1963, there is a sequel story, "The Marriage of Minnie", which appears at least as early as in Wendy, the Good Little Witch (Harvey, 1960 series) #7, cover dated August 1961, so this story must have first appeared sometime earlier.