I take Focal's point about the aunt attacking anything visible. The issue with this is that without visibility there is no deterrent so one is doing nothing to lessen the likelihood of a crime.
The only thing on can achieve, at best, is being able to find the person afterwards. The problem is that unless you spend a great deal of money home security cameras simply do not work as evidence. And in any case the jewelry will be long gone. Perhaps one can recover some of the financial value, but the chances are one will never recover the actually jewelry lost.
Of course if one is not concerned with the jewelry at all and simply wants to keep an eye on them, then you'll have top spend a lot of time staring at the screen, however you do it.
Equally I'd point out that the aunt would spend many an hour completely failing to unplug a dummy camera.
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Spycam needs wi-fi? 
Spycam needs wi-fi? 