She suddenly stopped replying to my message while there's nothing happened between us?

ik09011
I talk to this girl almost twice a day on messages. She suddenly stopped replying to me. So I waited and sent her a hi text again in 4 days which she still didn't reply to. Since there's nothing wrong happend between us. What should I assume and do apart from the point that she could be with someone else
She suddenly stopped replying to my message while there's nothing happened between us?
She suddenly stopped replying to my message while there's nothing happened between us?
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