Disabling Chrome Extension Allows Blocked Sites

Please explain how to keep our teen daughter from disabling the Chrome extension that is required to be enabled in order to make NF useful. She can go to facebook anytime she wants by disabling the NF extension.

Or, please update NF so web filtering works without using a chrome extension. I'm perplexed why the excellent filtering capability of Norton 360 can't be used to block sites per account.

This machine is still using XP... NF v.3.2.0.14, Framework 5.2.1.3

Thanks,

Greg