She's not responding back to my texts?

I've been friends with this girl for several months, and we talked almost everyday online and recently through texting. She takes a little bit of time to respond because her phone is messed up but this is the longest wait (2 days) for a response. Thoughts? It's not like she hates me or anything, we've become really great friends because we share a lot of interests.
Updates:
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The last text I sent her was "how did u celebrate the coming of the new year?"

AAnd never said anything bad prior, in fact it's all been good nice stuff. She's one of the "shy" types also, but we've both warmed up to eachother.
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And the conversations last awhile. We probably have over 450+ messages sent back and forth.
She's not responding back to my texts?
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