You dont you stick together forever
Well you could try the leapfrog technique though i bet it'd be easier if she lay down. Not as much height needed. <br />
Kidding aside, there's nothing you can do, just try and make new friends. I still remember all my old close friends even though we don't talk anymore. Something you just have to put up with really.
Loosing a close friend is hard especially if they betray you in some way. The best thing is to try and make new friends, though this may be hard. Always remember a true friend is one who will stick by you whatever, and tell you if you are going to do something silly. I will be your friend if you want and help you through life's problems
Did she die or move away?