Guys, when you text a girl at 5pm and she hasn't replied all day with her last online shows she hasn't been online since 11am, what would you think?

For example her last seen/online is at 11am, and you texted her at 5pm. When you check later around 9pm, she hasn't opened your message and her last seen is still at 11am. What would you think? And what would you do?
Guys, when you text a girl at 5pm and she hasn't replied all day with her last online shows she hasn't been online since 11am, what would you think?
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