One positive indication is any attention from her whatsoever. You might find that girls that don't like you tend to show you absolutely zero attention, therefore a girl that makes attempts to notice you or be noticed by you is at least viewing you in a positive light.
In your current stage, it's not so much a question of if she's got a crush or not so much as it is that she's at least thinking of the possibility. It can go either way in her mind, but she's at least curious enough to see into how things work out. My opinion? You're in good standing, but it's on you to improve upon the situation by getting the two of you on talking terms. Strike up conversation. Try and avoid sounding like you're pulling cliche icebreakers or pickup lines and instead just say genuine, what's-on-your-mind things. Find out things about her that will be important later, like what she's into (not just what you have in common, but things just about her) and what she likes about you.
You will learn one way or another that women speak a completely different language; first off, they drop hints that are largely too subtle for an average man to pick up. Her looking at you but looking away coyly sounds like a big, glowing hint to me. She wants you to talk to her. Second, the most important things to be mindful of are always the smallest. If you're able to make something of the smallest details or clues about her, she will be very impressed by your attention to her.
Women like confidence but hate pushiness. Confidence means striking up questions just like this one directed at her. Speak candidly and honestly and ask things exactly the way you want them to be answered. Hinting is for women; directness is for men. Pushiness is prying for answers when she's deflecting or throwing up defenses, in which case, reassess your approach or back away completely. For a relative newbie, you can get pretty confuzzled having a conversation with one of the goils. To help you, start by making a mental checklist of things that you are curious about or want to have answered. This is a testing of the waters for both of you, so it isn't unacceptable to keep your emotions low-key. By the end of the conversation make sure you leave an open invitation for you to talk again soon. Since you've made the initiative of striking up the first conversation, it may be more fun for her to be in charge of initiating the second. If you've passed her test of coy hinting she won't have any problem of seeking you out later.