What to do now with this girl?

Since she invited you she probably thinks you stand out among the rest of her friends. Get to know her more, don't rush into asking her out she may not be comfortable with that. Also don't harass her with texts. Try to hangout with her more in person,invite her places, and at school. Once you think yourself and her are ready, you can tell her you like her and hope to be more than just friends! Good luck!