In a medium saucepan over medium heat combine the water, vanilla pudding mix, and strawberry Jello mix. Stir frequently until the gelatin is completely dissolved and everything is well mixed.
Pour the pudding and jello mixture into a large mixing bowl and cover it with plastic wrap.
Place the bowl in the refrigerator for 4-6 hours.
Remove from the refrigerator and using an electric mixer beat until smooth and creamy.
Fold in the cool whip mixing until it is well incorporated.
Add in the marshmallows and diced strawberries. Gently fold in using a spatula or wooden spoon.
Add in the mashed strawberries and gently stir until they are well incorporated.
Cover and refrigerate for 2 hours before serving.
Store leftover salad refrigerated in an airtight container.