Block is not working?

I installed norton on the laptop of my daughter. 

It's working a litle bit, but when I block her laptop, but not between 2 pm and 9 pm for example for 7 hours, after 2 hours she tells me that it is already blocked. Then I must unblock it manually. I've tried almost everything and it's not nice for her or for me. 

I also installed it on her phone, but she still can do what she want, except for the websites.

Help?