2 envelopes unflavored gelatin, 1 ½ cups cut-up fresh or frozen unsweetened strawberries, 1 teaspoon vanilla extract, 1 cup low-fat vanilla yogurt, ½ package (4 ounces) reduced-calorie cream cheese, softened, 1 teaspoon Sweet’N Low zero calorie sweetener, 1 tablespoon orange juice, 1 tablespoon orange-flavored liqueur, ¼ cup granulated sugar, 1 can (20 ounces) crushed pineapple in juice, ½ cup cold water, ¼ cup heavy cream, whipped