Go for it. I teach 11 yr old girls for the same reason. They wanted to learn, and their mom's didn't know how. They're terrific - and not afraid to try anything. I had them sewing zippered pouches by the third lesson.
First project - apron. Second project - zippered pouches, Third project - pj pants. Fourth project - fleece hoodie with separating zipper.
etc.
Just go to your local Chapters/ Amazon etc, and look for an all around sewing book and use it for a resource. There are sites online where you can find a curriculum to follow.