@Riger Actually, that's a common misconception about LMGs. They're actually astonishingly accurate and easy to fire, because they're designed in such a way that the recoil from the round firing pushes the weapon up, meaning it's essentially fighting gravity for the shooter, and all the shooter has to do is keep it pointed in the right direction.
Her method of "aiming" was entirely incorrect, however. There's a reason we don't hip fire anymore. You basically can't see where you're aiming, meaning any hit is basically just luck (or you've adjusted the aim of the weapon after continuous fire because you saw where the projectiles were landing, which is still a waste of ammunition and potentially very dangerous).
Edit: If you look up videos of people firing LMGs full auto, you'll note they often fall slightly forwards when they stop firing. That's because of the interaction I was describing in the first paragraph: the weapon is actually basically floating in the air while firing, and when the firing stops you have to suddenly readjust the amount of effort you have to expend to keep the weapon up.