My s/o's depression

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My girlfriend has been very stressed with her studies and work lately, and I can tell she's different. She gets irritated by the littlest of things, and she even yells and screams like a maniac every once in a while for the stupidest reasons (she says they are stupid reasons herself once she snaps out of that state), going as far as to threaten me with physical violence. The point is I have tried very hard to help, and have tried different approaches.

When I ignore it, it still bothers me a lot on the inside, and no matter how much time passes, it always comes to a point when I can't keep acting like everything is fine. I'm staying at her parents place for some time this summer, and precisely yesterday we argued while she was driving and she almost drove off road from how insanely angry she got. When I confront her upfront about it it's even worse though, as she gets mad for me bringing it up and tells me to just shut up and ignore it, or just straight up cries without saying anything.

I try to let her see that I'll do whatever she wants me to do to help the situation, but she insists that it's not about me, and that she herself doesn't know what's wrong with her.

Is she depressed, /adv/? What can I do at this point? I'll answer all questions you may have asap. I already insisted that she should seek professional help, but she tells me to give her a chance to work things out on her own over the summer, and, to be fair, she has given me such a chance when I myself wasn't feeling that well in the past.

All posts appreciated. Thanks in /adv/ance.