I like "Garden Witchery" and "Cottage Witchery" best. "7 Days of Magick" is also good.
"Natural Witchery" seems like a rephrasing of basic Craft 101 info, like the author read a bunch of books and put the info in her own words. Her personal stories are entertaining, but if you have read other basic books, there is nothing new here.
I would recommend "Elements of Witchcraft" to any teenager who wants to start exploring the Craft. It is a far better Craft 101 book than "Natural Witchery." "Elements of Witchcraft" seems a lot more original and true to the author, while "Natural Witchcraft" seems like a rehash in comparison. If you don't mind references to siblings and school and parents, an adult could learn something from "Elements" too.
All in all, I like Ellen Dugan's work. It's good at showing how she and her family live the Craft in everyday life, not just in ritual settings.