I would choose a pattern that is easily accomplished and not too challenging so she gets the "feeling of accomplishment". I started sewing a couple of years ago, and took a beginner sewing class, and was thrilled to bring home a completed project "I made myself!" (I'm 50 yrs. old) It was a tote bag.
After that I saw an ad about quilting and went and did that class. I loved the project but found myself at home alone trying to figure out how to complete it. I have learned a lot since, but I think a project that could be completed during the class would have boosted my enthusiasm and confidence.