Girl hasn't responded for 2 days... Lost interest?

We've started dating right before summer, but currently in long-distance for summer until she comes back. We've been talking everyday, but for past 2 days she hasn't responded. I know she's been on FB/Twitter, so it's unlikely that she hasn't gotten lost all forms of communications or anything... Is this normal? or signs she's losing interest?
Updates
+1 y
so turns out she's been sick the past couple days. would that make a difference?
Girl hasn't responded for 2 days... Lost interest?
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