If she stopped talking for a month then even nonverbal communication says we are not dating anymore. If she wanted you to move down there she should have communicated with you and a decision should have been made. If someone stops talking I am going to assume that it is over. This seems like an elaborate silent treatment. You both should have made an effort to find out what is going on. If she is upset tell her that you assumed that it was over. She shouldn't have an excuse for this time frame and I would start thinking about moving on. You can't have a relationship without communication.
If this has been helpful press accept