Is it just me, or is the problem with doing something for one person in your family is that it makes you feel like you have to do it for everyone else? And let me tell you, my family is big (and just getting bigger) So that generally means a lot of work. However, this is a project I did for just one nephew, and making another one for his big brother wasn't a big deal:
Matching set! Ha! (No guarantees on making one for future kids, though, sis. You're totally on your own for those.)
Lest you think I'm being cruel for withholding my talents, fret not. She'll be fine because this project is a pretty easy concept and simple to execute, too. This is totally doable.
Just trace the outline of the shape you want on paper, cut it out, and use it as a template for placing your nails. Then tightly weave thread or string around the nails until the area is filled in.
Have you tried this yet? I'd love to see!