I see this a little different. There are essential 2 main ways to get from Sarnia to Courtright. One is down Vidal/River Rd which is the direct route that Noelle would have taken, on foot, that night. The other is to head down Wellington to Indian Rd, then hop on Plank Rd out to the county.....Plank Rd ends at Mandaumin Rd in the vicinity of where she was found.
My thought is, someone she knew picked her up near where she started walking, on the premise of driving her home. They took the Plank Rd route to avoid the RIDE programs which more often then not are on River Rd in the area of Corunna or the Aamjiwnaang Reserve. Then, something happened in the car....and this person/people panicked and dumped her where they did.