Is She Interested? (Text Messaging Question)?

First a backstory... A few weeks ago I switched schools. There's this girl from my old school who has tons of friends at my new school. So ever since I switched she's been texting me every couple days. The convos lasted anywhere from 8 messages to over 25. I would think that she likes me, because she always initiates the conversations, but we never interacted this much at my old school. Sometimes she takes over an hour to respond and responds with really short messages, and other times she responds immediately and with long messages. Even further, she helped her friend set me up a date for Homecoming, which she wouldn't so if interested in me. As you can see, I'm inclined to think she doesn't like me, but I don't understand why else she'd text me so often.Thanks so much for any advice you can give me!!!