Beat together cream cheese, white sugar, and vanilla in a large bowl until smooth. Stir in 3/4 cup mashed strawberries until well combined.

Beat together heavy cream and confectioners' sugar in a glass or metal bowl until stiff peaks form. Fold whipped cream into cream cheese mixture until evenly mixed; fold in 1/4 cup sliced strawberries.

Spoon strawberry mixture into graham cracker crust. Chill in the refrigerator for at least 3 hours before serving.