If a girl likes to put her hand around your waist, she either likes you as a friend or she is interested in you as possible boyfriend material. If she does this with a lot of people, it could just be a habit she's developed.
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She may feel a connection with you and is comfortable showing physical affection. This gesture could indicate that she is interested in you or simply enjoys being close to you. It's important to communicate openly with her to understand her intentions better.