Hello again! Glad to hear that my advice helped!
As for your current conundrum, might I suggest communicating with your trainer? Your trainer is perhaps your best liaison between his girlfriend and you, so if anyone can convey just how special that camera is to you, it would be him. The worst case scenario is, of course, that he ends up having to buy her a camera as well, but luckily, I’ve been told that mini cameras are still rather cheap on PokéBay.
Best of luck, little rotom!