It's difficult to live under the same roof when you are 12 hours away from each other. It's hard to have any kind of relationship with distance.
If she has stopped all communication, it is unlikely that she is willing to work on the relationship. There is a lot of detail missing from your question. If your marriage was amazing, what happened to cause the separation? What are the circumstances of your distance? You and she probably need to first agree that you want to save the marriage. If you are the only one, it likely won't work.
I'd suggest first reopening the lines of communication.