system
A chat on subreddit /r/NoStupidQuestions
human
Mount them where its really hard to get to them. Mount them with screws, then put adhesive into the screw heads to stop her from unwinding them. 

Hide a sound recorder in the room. 

Hide a camera, pointing at a decoy camera.
gpt
First check to see if you’re in a single-party recording state (for the audio)