Great job!
Now while she is still eager to build stuff, and in an artsy crafty mood, go on line, and look for local wood carving clubs. You will be surprised at what she can do by age fifteen! She is at a great age for learning working with wood, making bows, arrows, arrow heads, quivers, bags, etc. and carving. The majority of clubs will be more than just willing to teach her, and guide her, they will be very eager.
There are lot of very accomplished women wood carvers, and wood burners. I think she would really enjoy that. Especially when she sees women carving. I should have left well enough alone, but no....after years of nagging my Girl Friend to go to the wood carving shows with me, and after years of excuses of why she couldn't, she finally agreed to go. I walked out the show $80.00 poorer, and have since lost much more money, on knives, books, power flex shafts, bits, 10 inch band saw, and yet more knives.
But she is now slap eat up with it, and cannot get enough of it, and for never having even just whittled a stick, she has come far, very quickly, and took, second, and third, at the show, her club had, and is now a member of another club, further south, and paid to take lessons, from a woman carver, who is quite exceptional, and is planning to take more classes, and do it full time, when she retires. But take your Daughter to one of the clubs, or a couple of them, and she will be an ace in the hole for you, when you want to make something fancy for your bow, or equipment. Start her off with quality knives, and just the basic ones, and teach her how to sharpen them, and once very sharp, to keep them sharp. Good job on the chair, and good for you for taking the time to help her urge to build something. There was more than a chair built there.
Wayne