Granola girl is an aesthetic of crunchy outdoorsy young women: hiking gear, oat milk, kombucha, Patagonia jackets. Not concerning. Just a TikTok lifestyle label. Most granola girls are vegetarian, eco-conscious, into wellness. If your kid uses it constantly, ask them where they first heard it, not to police their speech but to understand which online community they are in. Most slang of this kind moves through TikTok and group chats, so seeing it in your child's vocabulary just means they are plugged into normal teen internet culture.