Tethering/Hotspot control

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I have what probably is a strange request, but here goes:

I'm getting the kid a Galaxy S2 for Christmas - it costs just as much to add her to my plan as it does to buy the prepaid minutes for her :)

I need to know if there's an app out there that can "lock" the ability to use tethering and mobile hotspot. Yeah, I know she can just download a different tethering app from Google Play and use that, but I want to make it a little more difficult for her :) Ideally it would have a "schedule" where it can be locked out during certain times, or at the very least a "passcode" that can be entered to allow the access.

I'm not concerned with data usage, but at home I have the Wifi turn off at midnight so she'll actually go to bed, and I know if she can tether or use the hotspot she'll just do that and stay up and watch anime all night :laugh:

So, is there something out there that can do this? My searches have been rather fruitless so far.