Kudos to you for trying to spy on The Detective before putting faith in her to save you from spaghetti monsters. A few reasons why The Detective is not responding to your delicious spaghetti ball:
When your printer is not printing, The Detective is off duty to catch some sleep. So you need to start a print in OctoPrint to call her to duty.
The Detective tries to be adaptive in order to reduce the number of false alarms. What it means is that during the first several minutes of a print, The Detective will only observe, rather than alarm. Therefore, when she sees a ball of spaghetti in the very first minutes of the print, she will think "No way! I must be wrong here. I will ignore this huge spaghetti ball for this print."
If you don't already have any time 3D printing time-lapse videos, the easiest way to test if The Detective actually works is to do the following;
Start a test print and let it run for at least 5 minutes.
Then you can throw in a ball of spaghetti and watch on the "My Printers" page to see if it's correctly identified.
Leave that spaghetti ball on the bed for a couple of minutes to convince The Detective that this spaghetti monster is here to stay, and she should send you an alert via email or text (if you have set your phone number in Preferences).