For starters, make sure she does a full uninstall of the game before doing a fresh one and see if that works before she tries putting ANY of the markings in.
Also, make sure she's getting the updated markings as well. If everything runs smoothly BEFORE she adds the markings, then have her add the updated ones.
It could be something serious so have her run a virus scan. The game itself doesn't give any virus and as long as she didn't click anything from adfly she should be good.
It could be that she was running multiple things in the background and that could be one of the causes of her overheating or that her computer can't simply handle the load at the time.
Looks like she was using some sort of ENB mod, as the one I use has green text and such like that as well. She might have been playing with it disabled, since sometimes it randomly remains disabled/enabled.
Try either pressing F12 (if it turns on airplane mode, just press the FN key + F12) to turn it off, or otherwise backup any presets/meshes/maps/etc. and reinstall to get rid of the mod, since otherwise its fairly difficult to get rid of it manually.
Hope this helps!