Why is she taking so long to text back?

Alright, so I texted this girl I know asking her something, and she replied back three minutes later. I reply back with another question, and it's been half an hour and no reply. I know she's by her phone cause she replied quickly enough the first time. So why is she taking her time to reply to this one? This girl also has a habit of just disappearing during text conversations, no goodbye or anything, just stops responding. I guess that's what she's done this time too. I surely can't be the only one who finds that really rude? If I'm asking her a direct, friendly question and she can't be bothered to respond at all... I'm sorry but that just really, really annoys me! What is it with people?

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