Is this girl into me or what?

Ok so Ive known this girl for a while and I really like her. Im not sure if she likes me. On facebook she always starts the conversation, she says I should go up to spokane with her sometime when she goes. I swear this one time her pupils were dialated, which apparently means someone likes you, when I saw them. And she told me that I should sign up with her in activity period tommorow at school. plus all that other flirting jazz xD