I don’t think you would make it in any way more likely, but perhaps you could experience some relief from your worrying by affirming to yourself and the universe that you do not wish for anyone to be raped, your girlfriend, other women like her, any women, any person.

Perhaps there’s even a rape/assault/abuse helpline or a campaign in your area that you could support to make it clear (to yourself, to the universe) that that’s where you stand, and your fantasies are not wishes.

To be clear, again, I don’t think that your fantasies have any effect on the probability of your girlfriend or anyone to get raped. It’s just a suggestion to help you not be so worried, because worrying sucks. My best wishes to you and her.