I have a lot of questions about this story. The area is so remote but a man just happens to leap out at her with a knife. I’m sure the police are searching for his campsite, his car or other tire tracks, etc. Something seems off to me.
I subscribe to Facebook groups of hikers in the Sierra. There are a dozen or more reports of missing hikers every hiking season up there. Sadly, most are falls off the cliffs or drownings. In the many years I have been following missing hiker reports I have seen no other cases of violent attacks by other campers or hikers.