You remind me (see my previous reply), she also had a map, extra batteries, a first aid kit, and more (besides the whistle and compass i already mentioned.)
Solo hiking doesn’t have to be dangerous. I have done it on the AT, as well as in the Alps. But I was careful not to over-estimate my competence, especially in bad weather. This poor woman was just incompetent. “Taking classes” is not what gives you outdoor skills. Maps and compasses can be baffling to a beginner, but come on. This death was totally unnecessary.