SPRINKLE gelatine over coffee in saucepan; let stand 1 min. Cook on low heat 3 min. or until gelatine is completely dissolved, stirring constantly. Cool slightly. Meanwhile, mix yogurt and sugar in medium bowl; set aside.
ADD gelatine mixture to yogurt mixture; stir with whisk until well blended. Stir in 1-1/2 cups COOL WHIP. Pour into crust.
REFRIGERATE 2 hours or until firm. Top with remaining COOL WHIP, fudge topping and berries just before serving.