Girls, Why she is not responding me? What can I do now?

We are in long distance relationship since 2 year. We both are from different country. Suddenly since 1 month she is not replying my message, not answering my call. and Facebook, Whatsapp and Phone call is only option which connects both of us. How can i contact her now? There is no dispute between us. i dont know why she suddenly stop replying to me. What should i do now?
Girls, Why she is not responding me? What can I do now?
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