I don't worry about her. If I did, I'd be worried all the time. I think she's perfectly safe. She has always traveled by herself...she actually lived in Scotland one summer during college...went by herself, didn't know a soul and got a job in a deli and rented a flat for the summer and traveled all over Northern Europe alone on weekends.
I'll have to share part of an email from her in a later post about her stay in Europe a couple of weeks ago. She was at a leadership conference in Brussels for 4 days, but the other 10 days she was traveling alone in Prague and Austria.