What a truly dreadful experience for this poor girl, at least they have arrested those involved.
These events make the news because they are rare occurences. I walk alone in town or countryside, always have, always will. That is not to say that I am unaware or unbothered by such occurences nor unaware of the risks.
I always have my phone and keep alert, my worst experience in the rural area we currently live in has been a woman with two visibly strong bulldog type animals, both wearing muzzles, she was having great difficulty controlling them. They leapt at me and one hit my arm hard enough to bruise it.
As well as keys in my pocket (I was taught how to use those as a weapon by a police officer) I also always carry a pair of secateurs for cutting back brambles and other plants, which could be put to other uses if necessary. I would also not hesitate to put my knee somewhere painful if required. I can still run at a reasonable speed if needed.
When I was a town dweller, I always avoided back alleys, riverside paths and commercial areas after dark and kept to well lit well used streets.