What if she did have a creepy work stalker that put tracking on her phone for just a second...he would likely take the time to learn her schedule and pick and even scout his location....seems intersting to me the time of her last documented run was almost exactly a year prior (within a month)...what if she spotted her coworker stalker in her tiny town and it totally creeped her out...but not enough where she actually thought he was creepy enough to be in Princeton cause he was following her, so felt paranoid even mentioning it to others...but still change her settings anyway....just a thought
A thought I've had is she could have left her phone alone at work long enough for him to grab it and do whatever or open the app and see her routes and take a photo of the screen for his own records or to install some secret thing. It would creep me out very much if i was her and someone from work or who I recognized frlm New York randomly appeared. Even if at the store it still would weird me out and I really think something made her change the settings. Even a creepy person at the store who seemed to know a lot about her runs. And I assume that she could share her runs on fb and maybe she did and they saw them.