Spread softened vanilla frozen yogurt evenly into graham cracker crust. Layer orange sherbert over yogurt flattening with your hands as needed. Cover with plastic wrap and freeze 4-6 hours.
Preheat oven to 450°F. In a large bowl beat egg whites and sugar together with an electric mixer about 2 minutes. Add vanilla.
Simmer 1-inch of water in a saucepan on the stove. Place the bowl of beaten egg whites on top of water. Heat egg mixture, stirring constantly, for 4 minutes.
Remove bowl from stove top, then beat again for 5 minutes until stiff peaks form.
Top ice cream with meringue, sealing pie around its edges.
Bake 4-5 minutes, until meringue is lightly browned. Serve immediately. Freeze leftovers, if needed.