Washing fruit before storing?

[Chef Moore-ardi]

My mother-in-law insists that washing fruits and veggies before storing them causes them to spoil quicker. In other words, she brings them home from the store, puts them in the fridge, and washes them only right before she consumes them.

I bring them home from the store, wash them, sometimes cut them up and put them in different bags, and then put them in the fridge. She insists that doing it that way will speed up the spoiling process. My produce seems to last substantially longer than hers. Is it because I wash first or is she right?