I'm surprised not many people have asked about ROA. For all we know, she was a huge psychonaut at a "party" (which many of us have, 5-10 people eating psyches) who was administered way too high of a dose of pharmahuasca or ayahuasca. The DMT could have played a very real part in the death if this were the case. I keep reading she "took" the drug, or her boyfriend "gave her some", which doesn't seem like smoking.
If it was smoked I don't think it has anything to do with the drug, unless she ran to the pool somehow, then couldn't get out (doesn't seem normal...). The effects would floor you and you couldn't get there, or you would be fine by the time you got there...In this case it was probably an accident, or something else.
Either way, I'm sorry to hear about your friend's death

. DMT should not be blamed for the death in my opinion, and it is going to get bad publicity for this I'm sure. Education on all drugs, including psychedelics, would help to prevent future situations like this.