It's like you asked her out over the phone for her brother to be the one to give you a reply. Actually, phone is not a platform for proposals. We people of today don't know that. I suggest you let her be. You don't force love on people, it'll only make them hate you. Meanwhile, keep praying for guidance in all you do. As for losing her, if she isn't destined for you, you've as good as lost her. So you better make up your mind for whatever the outcome may be. No one dies because someone left him/her. No matter what, life must continue. In all, God should be your best friend, to direct, comfort and even make things easy for you. Thanks.