If I were going to make it I would buy the glow necklaces and whip stich them around the wings. It wouldn't take long to sew them on and the expense would be much less then buying LED lights to sew on the costume. You'd have about 8 hours for the glow sticks to be lit up. That should be plenty of time to finish trick or treating. For additional lights they sell all kinds of light up bracelets, earrings, necklaces etc that could light up other areas of her body.