Mix cream cheese and milk together. Spread in the bottom of pie shell. Fill shell with 2 1/2 cups blueberries.
Glaze: cook 1 cup blueberries in ½ cup water. Strain for juice. Boil the juice in sugar, cornstarch, lemon juice and ¼ cup water until slightly thickened.
Pour glaze evenly over blueberries in pie shell. Chill and serve with sweetened whipped cream.