I'm not really sure that this can be likened to a diary when it is called a "chat" but that's for the legal system to determine, not me sitting on my couch.
And yes, some laws are "strict liability", I don't think this one is.
It's not any different than telling an automated phone voice tree system that you plan on killing someone and then being surprised that your words were later heard by a human. She absolutely told a company's computer. She sent the message.
The law may have been intended for more direct threats to a person as a means of intimidation, but that's a separate conversation.