My daughter is bypassing Norton Security on her Android

My daughter is bypassing Norton Security on her Android by turning her phone on and off continually.  When the phone turns on, she has about 10-20 seconds before Norton Security kicks in.  So, she turns her phone on and off to bypass the time allotted feature, and she turns her phone on and off to access Skype, which we have blocked.   Therefore, Norton Family is pretty much useless to me.  What can I do to prevent this?