What is the most logical next event?

How to flirt girl to girl
Be friends with her, if you see her regularly.
If possible, before you start any flirting with her, get to know her and become friendly with her. If she's a girl you like at school, begin by talking to her in class and saying hello in the halls.
If that goes well, text her, call her, or ask her to hang out. If you don't like her as a friend, then you probably shouldn't be flirting with her.