"The way they look at you" is terrible advice because of confirmation bias and you can't really tell someone's feelings but how they look. If she goes out of her way to talk to you that could be it but she could also just be friends with you. People who like each other tend to open up more and be more casual, less space between you and more comfortable with touching, making jokes and acting like best friends (everyone is different though). There's no sure way to tell unless she says it directly unfortunately
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