I'm sorry that you and your best friend are having problems. Could it be that she is having second thoughts about joining the army? Maybe she's scared about having made such a big decision. It could be that she's isolating herself from you because she knows how much she's going to miss you and she's trying to insulate herself from the hurt. I would think she would want to spend more time with you but everyone handles things in their own way. See if you can talk to her again and tell her that she will always be your friend and you will always be there for her no matter where her life takes her. Sending hugs to you!!