I don't post much but I really think this is a stranger abduction. Maybe it's because I was abducted by a total stranger in a parking lot many moons ago. It can happen quickly, with minimal noise and struggle. I live next to Plano and even with my past experience, I don't think I would have felt freaked out walking to my car, in that area, with someone walking with me most of the way. I've run into some upper class sickos in my life. Wouldn't be surprised if one of them saw the opportunity and took it. I really hope she is found unharmed but it is starting to seem unlikely.
This is what I've though all along.