I am a young woman and lived in the same complex as Adrienne only a couple years ago, so this case has resonated with me. I'm currently moving away from a residence at Baseline/Rural, close to where Begay/George lived and Begay's body was found as well. To say that I am shaken is an understatement. I can't say I have any truly fresh insight, but I would like to offer up any local information that I can, like my fellow Tempe residents before me. I agree with goblinsolo that the area surrounding Adrienne's complex is not a safe one. I remember countless occasions where the complex was part of a police perimeter, if I remember correctly due to robberies at the Hardy/University convenience stores. I never felt comfortable. There were handfuls of shady individuals that passed through- residents, guests, transients, etc. I watched a man get arrested from my balcony. I broke my lease and left because the mix of things caused me so much anxiety.
For whatever reason I still cannot discount the theory of the Salinas and Begay/George cases being related, only by chance encounter. Maybe George became blood thirsty after leaving Begay, but again, where would Adrienne be? Would he really become smart enough to, I hate to put it this way, dispose of the body in a less obvious way? I'm wondering if LE has searched the canal just south of Rural/Baseline. Find it as "Sun Circle Trail." It crosses paths directly with Rural Road. I agree that the "swamp" like area near Tempe Town Lake (the Western end, near the pedestrian bridge, correct locals?) may be an area of interest, but surely they would had searched this area while dragging the lake?
Unrelated to Begay/George, it really does seem that the roommates and party goers know more (or perhaps less) than they are attempting to lead us to believe. Absolutely nothing adds up. Maybe they are directly related. Maybe they are whipping up false information out of fear. I think we are funneling too much speculation into the argument with her boyfriend. Teenaged girls get emotional, make lots of phone calls, don't often leave voicemails, are all over the place. From what I have gathered, it seems like a very typical young love argument, like many I have experienced myself. She may had not been in an entirely clear state of mind because of this, but it was probably not her downfall.
Unfortunately I don't think that that there are any clues to be found in social media, Adrienne's especially. Brooding, maybe, but I don't think that it can truly attached to depression. Seems nothing out of the ordinary for a teen girl.