I also agree. I don't think her stunts, clothing, music were red flags. If so, 1/2 the teens in the country would be potential murderers.
I tend to think (MY OPINION) it had more to do with her upbringing, and sadly, her family. I'm not blaming them, or at least not the grandparents. You do what you have to do, and what you think is best at the time, and the best you can under any given circumstances. This family was presented with a combination of circumstances, some based on poor judgement of some family members, some outside their control, that I certainly would not want to have to deal with myself, and would not wish on my worst enemy. No family is perfect. We all make mistakes and poor decisions along the way. Some of us are lucky enough to get through without serious consequences and some aren't. Some of us have superb support systems, others have little to none. I doubt anyone consciously set out to damage Alyssa. Unfortunately, they also didn't find the right help to fix Alyssa before it was too late, although there's evidence that they tried pretty hard.
We see that there wasn't a whole lot of activity on her various web pages over the last couple of years. Some, but not as much as some other teens I know, i.e. several updates per day. Maybe the gp's DID know about her videos and MS, FB, etc. Maybe they were dealing with it. That may be why she had her phone taken away. I don't think the stunts indicated any huge problem. I don't think the pics with clown makeup & blood were that shocking, because they WERE taken at Halloween. I admit, the scars on her wrist were scary, but she was already in therapy for "cutting". The meat cleaver necklace is scary, too, but may have been passed off as part of a costume, since we don't see it in any other photos. They may not have seen the hobby="killing" comment. The "dark" comments on that other site were almost all song lyrics, not original thoughts of her own. And the dark "emo" clothing is exactly what every other teen at her school was wearing, mainly because it's about all you could buy in stores in JC last year. I'd have made a big deal of the fake stabbing pic, if I were her guardian and had seen it, but you can't see her in it, so she could have lied and said it was someone else.
Idk, I just tend to think that her gp's had their hands full and deserve some slack, and some sympathy. Unless we hear that they knew she had this planned and didn't do anything about it, but that's not at all likely to be the case.