I didn't pick up that she was depressed to that extent. I thought she was more annoyed and angry that she had to return the shorts to her friend, which as I understood it was the only reason she was walking alone in that area at the specific time she went missing.
I believe it was said that she was in communication with her boyfriend and that they were texting back and forth when she went missing. This would mean she was texting as walking and I think this makes it unlikely that she was crying. I remember her boyfriend saying in an interview that he was sure very quickly that something was badly wrong as Brittanee was replying pretty much straight away to him by text. My fear is that Brittanee might have been distracted from what was going on around her because she was typing a text to her boyfriend, its easy to watch someone who is distracted. Looking at the specific area she was walking in it does seem possible to me someone could have quickly snatched her as she is a small girl and was likely distracted by her phone. There are also quite a few shadowy side streets that lead off from the road she was walking down, ideal places to hide, watch and spring out from.
I totally agree that it would have to be someone local who knows the area well. Abduction is so risky in such a busy area and I think Brittanee was stalked and this was planned by someone who knew exactly which routes to take. The cell phone pings are the best and sadly the only real lead and I hope they yet lead to something. I wonder if further scrutiny of vehicles on camera in the area might lead to something? A painstaking process but it was part of what led to Levi Bellfield being linked with Amanda Dowler in the end.