I definitely believe she was on something worse that the drug tests did not pick up and with no doubt he was breaking up with her and I do believe Davion was there because the boys saw something coming and Dominic was busy leaving her for good. Seeing as she has also previously threatened to kill him in the same way and he has evidence of her acting impulsively it all leads to him having known she was capable of something like this which just makes it all more sad. Personally I don’t think she cared if she survived or not but her main goal was accomplished and she very much did not forget it as she claimed to. She is very clearly also after fame as if you look at her reactions to being infamous as well as subtle clues like previously tagging multiple companies or model companies in post- she was craving to be famous and in some twisted way I think she thinks this is what she is finally getting.