Might need to find some old fashioned "caps", like they used in cap guns. Then somehow fashion them to the door latch so it goes off when she closes the door too hard.
It's a toughie...sigh.
I had a gf that didn't care about things similar to that - like banging my door on other cars in the parking lot, etc, or scratches, dents, etc. "It's just a thing. It doesn't matter. Just a thing to get from point A to B. Blah blah."
The only thing that changed her tune was when she bought a decent pedal bike (from a specialty store, not department store). She paid like $400-$500 for this with her own money (back in the fresh out of school days - that's a lot of money).
She babied it like crazy, and expected me too as well.
I then pointed out that her $400 bike was "just a thing. It doesn't matter. Just a thing to get from point A to B. Blah blah." "In fact, just a thing that was less than 1/20th the price of my Jeep too."
Only then did she seem to understand my feelings about caring for my Jeep.
I guess that was easier than starting to slam her china cabinet or putting her wool sweaters in the dryer, etc.