Smooth operator- I totally agree. I started off thinking that Maura had left for a temporary break to get away from it all, but I feel like I am becoming more convinced that she was intent on suicide. That said, it doesnt preclude the idea that she could have succumbed to foul play, after the wreck that messed up her plans. If she was in fact, suicidal, then it makes her even more vulnerable because she might have been taking risks that she normally would not (e.g., hitching a ride etc) due to her fragile mental state.
Its also true that it would be extremely unlikely for her to come across a "serial killer" within that time frame. Serial killers are predators, but not all predators are serial killers. Serial killers have a rare pathology (thankfully) whereas other predators (eg. rapists, controlling men, violent men, men who abuse their wives and/or children, drug addicts etc) are more common. I believe its perfectly possible that she could have been picked up miles down the road, several hours later by one of these predators, it doesnt necessarily have to have been a "serial killer".
Its also true that it would be extremely unlikely for her to come across a "serial killer" within that time frame. Serial killers are predators, but not all predators are serial killers. Serial killers have a rare pathology (thankfully) whereas other predators (eg. rapists, controlling men, violent men, men who abuse their wives and/or children, drug addicts etc) are more common. I believe its perfectly possible that she could have been picked up miles down the road, several hours later by one of these predators, it doesnt necessarily have to have been a "serial killer".