You are annoyed out of fear I would imagine.
You got a fright and felt very helpless being hours away.
In your situation I would tell her how dangerous it is to be so drunk and to leave her friends.
Stress to her AGAIN how important her personal security is.
Being sexually assault is a deeply traumatic event that often changes a person for ever.
Stress to her that you want her to do everything she can to prevent that happening to her.
Stress to her that some men actively prey on drunk women and she is placing a target on her back.
That's all you can do.
It is a shit world we live in.
I might add, I also say the same to my son's to be very careful being out at night, pissed and on their own.
They know to always jump in a taxi which is linked to my credit card, if they need to.
I would much rather they call me, whatever the hour.