The best answer is to just use black tape over the lens!
Think of it this way…
You have a can of peas! All you want is to take out a spoonful, now what do you do? You can’t reseal the can and the quantity is now different! To add it it in a few days what’s left will have spoiled.
Apple designed the system and the display assembly in such a way you can’t physically disconnect the camera internally without damaging the system as well as the display its self.
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=== Update (11/25/2020) ===
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Apple offers a system management app which companies use to manage their gear or you could create an admin account you use to control your daughters system, Limiting her account so she can’t alter things (apps or OS).
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Then using Terminal remove the camera resource from the system. WARNING I haven’t done this in quite a few years so I’m not sure is the newerMac’s and macOS’s will respond nicely.
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=== Disabling the Hardware of the Camera: ===
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Through this method, the hardware is completely disabled, which means that you won’t be able to use the camera for any purpose. No application, whether built-in or 3rd party would be able to access the camera until you reverse the process.
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# In this step, we will create a backup of the file. Open the terminal and type in the following command. Remember that you can skip this step if you don’t want a backup created. But it is advisable to keep a backup so that you can reverse the process in case you want to use the camera again.
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## mkdir /System/Library/QuickTime/ .iSightBackup
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# It’s now time to move the Quick Time component of the iSight camera (which enables apps to access it) to the backup folder we created in step 1. Use the following commands:
# In case you want to use the camera again, just put the file QuickTimeUSBVDCDIgitizer.component in the following directory /system/library/QuickTime and reboot.
The best answer is to just use black tape over the lens!
Think of it this way…
You have a can of peas! All you want is to take out a spoonful, now what do you do? You can’t reseal the can and the quantity is now different! To add it it in a few days what’s left will have spoiled.
Apple designed the system and the display assembly in such a way you can’t physically disconnect the camera internally without damaging the system as well as the display its self.