Woowoo,
It's hard to say. When we have excessive worrying, it is made more intensive when there is some one we love involved.
The thought of losing that person is unbearable. On the other hand we can not keep them locked in a cage so that we always know they are safe, either.

I think you are wondering if your worries are a premonition (sp) ?. There are things in this world that are not explainable, I believe, so I would never say that it is impossible.

But on the other hand, for every plane that takes off and lands safely there is probably someone who worried that it would not.

Like I said...you can't keep your girlfriend entirely out of danger at all times. Statistics say she will be safe, for what that is worth.
She must make her own choices.
Some times all we can do is let them go and pray like heck.

I wish I could be more comfort and help. Keep posting if it helps and welcome to the forum.