Make sure she has a money belt to keep her traveler's checks and passport in. My daughter got into a fracas with a gypsy type guy in Paris...had to shove him away. (This I found out about AFTER the fact.)
BUT, my daughter loved Paris and wants to go back. It is a beautiful city. I will keep your daughter in my prayers.
Good advice about the money belt, too........I'll tell her.
As well as the rest of Europe.;^)