is she interested?

I started talking to a girl that i like last week. we had an concert. She invited me to sit next to her. we didn't talk much on the way there. But on the way back we did talk. I was joking around with her. She tried to teach me the cup song. We talked about the band trip were going to go on. She was smiling and enjoying the conversation. We both laughed some. When we got back our band teacher said to help bring the drums back inside. And she said to me "i though he said help hug each other." i was honestly thinking about hugging her then. I didn't have a crush on her until like the next day. I discovered she is a great person. She's pretty in my opinion. She probably doesn't think so. but honestly she is.