As her success grows, she could consider looking for local specialty bakers who might make things for her to sell. The apple turnovers reminded me of when I lived rural. There was a dairy farm that also had an apple orchard. They had a small pie shop--very well-known in the area, but not on a main road. A local farm stand sold their pies sold their pies.
Similarly, I think I've mentioned here before, our electrician owned a maple tree farm. His syrup was sold at several local shops. To the best of my knowledge, he didn't sell retail himself. But, your DD could look for similar small businesses in her area that would be appropriate for a symbiotic relationship (maybe in a couple years, if she's just getting started).