Hi,
I am sending you a couple of recipes to get you started. If she used Bisquick there would be no need for baking powder or baking soda.
http://www.bettycrocker.com/recipes/classic-bisquick-peach-cobbler/a2efbfa6-3233-4f7a-bf5b-43ce62bd1055
http://www.bettycrocker.com/recipes/apple-kuchen-coffee-cake/0adbbc76-a19e-4226-b6d6-ff7f8747f1fd
Good luck!