This is the paradoxical times we live in right now.
Don't do something? She walks into the office and start shooting the place up. Several officers and innocent people are killed. Cue the media claiming, "You should've known she was talking about this an AI bot! Why didn't the bot tell anybody she was planning a mass shooting?!"
Do something? She gets rolled up by the cops and questioned about what she was talking about and brought to the cop station and interviewed. Cue the media claiming, "This is an unethical way to use AI, this is an infringement on free speech! This is authoritarian!"
I believe in free speech as much as the next person. But in this day and age, its almost better to be safe than to have to explain to someone's loved ones you had to chance to prevent this and did nothing.