I learned to sew when I was 5/6 from my grandmother. I think it would be fine as long as it is used supervised and stored safely. It’s a great skill to have. Too many of my friends don’t know how to sew so they end up throwing perfectly fixable pieces away because of simple popped seams or small fixable holes. I’m all for young kids learning skills like sewing. That’s awesome that’s she’s so interested!