my advice is to
- guide her to walk down different street to avoid them.
- reenforce to her that she did nothing wrong, and
3 remind her of societal dangers of females dealing with groups of dudes.
they're like angry apes. with guns and patience. we can argue about equality and women's rights and all that but bottom line is a young female is, unfortunately, a vulnerable target in certain scenarios. she has to be aware of her risk vectors to react better.