In 1-quart saucepan, heat lemonade concentrate and water over medium heat just until lemonade concentrate is completely thawed; remove from heat. Cool. In blender, place 3/4 cup of the lemonade mixture, 1/2 cup of the raspberries and 1/4 cup of the yogurt. Cover; blend on medium speed until smooth. Press mixture through small strainer into medium bowl to remove seeds.