Hello, I just purchased a glock 19 gen 3. When I went to the range to shoot it, I decided to bring a friend who is brand new to fire arms. The fire arm continued to jam when she was shooting it. To my surprise, I had no issues with it whatsoever whenever I shot it. I put in 100 rounds through it with no malfunctions, She put 10 rounds in with 5 malfunctions. It seems obvious that this is an operator error, but what could she have been possibly doing to cause these malfunctions?