DD9 is friends with a girl who is a bit "older" than her in some ways e.g. is quite into make up, has a phone, is generally a bit more of a tween than DD, who is basically a (nerdy) kid who climbs trees. I have been tasked with finding a birthday gift for this friend and obviously want to get something she will like, but also not anything which will be either inappropriate or too childish. DD and I hit on a bath bomb making kit as something which would be fun but also suitable for someone who likes glitter and makeup. But I would be really grateful for insight as to whether your 9 year old would find it fun or babyish.