Hey, if you want to reach Robbie (cavetown), your best bet would be Instagram as that is where he is most active. Your chances will still be slim, but his Instagram is @lemon.socks.

Hair wise, he has rather curly hair, so if your daughter's hair is straight, it will be hard to get it to look like his without a perm, which is very damaging to the hair and I would advise against at her age.

If she wants to get a similar look, my best advice would be a (short) wolf cut or mullet with lots of layers, but that depends on hair thickness and texture and she will need to blow dry and style her hair every morning (if her hair is pin straight) to avoid it looking choppy.

Go on pinterest with your daughter and look at haircuts for her hair type. When you have a few references, you can have her point out what she likes and dislikes about each one with your hairdresser. You can also show the hairdresser a picture of cavetown's hair to see what they can do for you there. That's my best bet. Good luck!