Well here's a creepy thought:
What if, it was SM herself, but she was in a state of distress and didn't really know what she was doing? Possibly incapacited earlier and left alone for a few moments, she reached for her phone or keyboard, trying to get herself some help.
I hate to even entertain that idea, but I guess that might be possible.
I to tend to believe it was someone pretending to be her, however, and doing a really terrible job since, it was out character for her apparently, according to those who knew her.
Except BM, of course, if it was actually him.
jmo