Yep, Max is right. Gambling can be on more than one website. Its rather sad when people get this low. They turn into a little kid and you tell them not to do it, they keep doing it like your commands are just the wind....
alvine has the right idea. I don't think we want to have any damage of property. But setting the controls in the control panel can surely make it where only you can access the web browsers.. You don't have to block the internet. Just have a Passworded account that she won't know and have hers on lock down.