09-22-2017 05:59 AM
As you say your daughter own or uses the camera my first instinct is that the damage you can see is caused from alcohol based products ie makeup or similar. I have had the exact same type issue on a Sony camera using Carl Zeiss lens wipes, they took the protective film off the rear screen. You notice this also on a lot of cameras shutter button after vacation where various products are on the skin and remove the coatings from you equipment.
It does not explain however the non functional GoPro other than bad luck with battery’s.