What should I do to be with this girl?

So I`m a girl and I like a girl. She and I had some moments that made me think that she might like me to but I`m not sure about that. She looks at me a lot and she follows me on instagram and snapchat. Her looks are intense and like she is trying to tell me something but I don`t really know and I need other peoples opinion. We don`t talk to each other and we are not in the same grade. I know that she is a lesbian, I hang out with one of her close friends.
What should I do to be with this girl?
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