I think you should email her and tell her how bad you are feeling and that part of that is because you feel abandoned by her. You have a long relationship, so it would be hard to throw that away and go with someone different. But at the same time I think if you let this fester and aren't direct with her you are going to feel worse. Maybe see if it is possible for you to move up your next session if she isn't willing to talk on the phone?