Yes,exactly!
I lived in the town of Redding,CA for three years, 2011, 2012, & 2013 and I used to go running there. Prior to living in the town of Redding, I went running almost every day, but when I moved to Redding, CA I stopped going every day, it was an unsafe area, even though I only went during broad daylight, usually around people (sometimes parks, but there would be people around).
Running by myself, in Redding, CA, gave me the hebie jeebies.
With the evidence presented, I'm leaning towards her voluntarily leaving...Of course, we are not given all of the information that the police have. By why no evidence of a struggle? No one simply vanishes into thin air. (I'll contradict myself for a moment: except Tera Smith did on the same road..)