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Is she looking you in the eyes longer than normal or glancing at you when you're not looking? This is usually an indication that someone is attracted to you. See if she makes excuses to talk to you, or tries to get closer to you. In other words, tries to be with you. This most likely means that she's interested Does she seem to get upset when you're around other girls or try to jump into every conversation you have with one? She's probably jealous of the attention that they're getting from you. This is a clear indicator she wants to be more than friends. See if she gets upset, or tenses up when you talk about other girls. Because that makes her nervous that you might have interest in other girls and not her.

Summary:
Pay attention to eye contact. Jealous tendencies.