Stepdaughters Birthday

My stepdaughters birthday is coming up next month. We're planning to take her to a water park IF it's still hot by then. But that's most likely coming from her dad since he brought up the idea. I still want to get her something from my part. She'll be turning 9 and I have no idea what to give her. She's more of a little grown up rather than a kid LOL she doesn't play with barbies at all. She always wants to go shopping if we ask her what she wants. So when it comes to toys, it doesn't seem like a good idea. Only thing she really likes are SHOPKINS.  She loves them lol that's as far as I seen her play with toys. Any suggestions would be greatly appreciated. 
Thank you,