When I was a kid I read a book about an alien girl who came to live on earth with her dad. He started dating a human and she had a daughter the girl became friends with. The girl talks about body surfing a lot and how she like becomes one with the water. She also talks about her dead mom. When they come they pick names and I think her dad picks something to do with coke or Pepsi because he likes the drink. I'm looking for the name of this book. The book name might be the girls name but I don't remember what that was.