Leave it as a reminder to her
And anyway, if you fix it and then she needs to use it again…
This.
You will spend a lot of time, effort and money fixing it and then something else will happen to it and you’ll have to do it again. And again probably.
Fix it when you want to sell the car.
Never understood why people bother mending cosmetic stuff like that, I drive around with far worse.
.
Anyway, if you must, swapping a door is a doddle, just done three on my Transit (to change from no windows to windows, camper project, not just to get rid of a scratch.) If you have central locking and electric windows at the back get a new one which also does, keeps it even easier, fitting electric windows can be a PITA.