I think I'm going to have to tell my girlfriend that she needs to calm down and not lose her temper
Why does your gf need to calm down?
I'm watching a movie from my tablet and she's been making all kind of noises like she's frustrated.
She's your gf so you should talk about her temper to her. IF you told her appropriately she'll understand.
I don't know if it'll work. I've already talked about it and she doesn't want to change.
You should try getting through to her again. She may not be aware that how she is acting isn't really acceptable. It might help if you bring it to her attention.