If a girl doesn't reply back to messages or does it very late?

If a meeting was setup between a guy and girl by their common friends...

They meet for sometime , had very small talks , they did exchange numbers.

After sometime the guy messages her. Hi/Hello/ How was your day etc etc... to which she replies very late or sometimes no reply.

He asked when can he call... to which she says whenever you want to. But also says she's sleepy at the moment. So he doesn't call her obviously.

So she just doesn't reply back to a simple Hello, how was your day/what are you doing etc.

So what does this all mean?

Maybe she's kind of shy. She likes him hence she's shy and doesn't gets words to talk
She's a shy kind of girl who might open up with time. He should not give up. He needs to put more efforts
She's just not interested in him. It's very clear. He should forget about her and stop messaging/calling
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If a girl doesn't reply back to messages or does it very late?
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