How do I tell this cellist I like her?

I have a cruse on this cellist in my orchestra but she’s taking 6 AP classes next year and is dropping the orchestra. I managed to get her number so we could chat platonically since we live about an hour away from each other, but we don’t chat a ton. I know she doesn’t like me romantically but I just want to get it off my chest. Anyone have advice? She also really likes Hamilton if you need creative ideas.