How do you know when your sister is dating someone?

You might notice changes in her behavior, such as being more secretive about her phone or spending more time away from home. She may also start sharing less about her daily life or become more excited when talking about certain activities. Additionally, if you see her dress differently or mention going out with friends more often, it could be a sign she's dating someone. Observing these subtle shifts can give you clues about her relationship status.