Maybe she put his camera through the wash as like 'here's how much I care about your precious camera' statement .. I think she thought deleting pics and washing it was enough to destroy those.
That's pretty believable. Out of all the scenarios I came up with for why that camera was there w/ the pictures deleted, I never even thought to add the Jodi-rage/spite factor.
I bet he told her he bought the camera for Cancun, it was new and just taken out of the box.
The whole murder was because of rejection rage, IMO