How neat! I'll bet she was super thrilled with her birthday gift. What fun you'll have together picking out fabric and a pattern. Your 6-year-old will probably have her big sister making doll clothes for her in no time.
I'm hoping to teach my DGD's to sew, but it hasn't worked out yet. We're moving soon (this weekend, next week, or the week after...sometime anyway) and I'm pretty sure I'll have a much nicer sewing area once I get it set up. Then, hopefully, they'll be more interested and I'll be more organized and feel more comfortable teaching them.
Have fun this weekend! :D