Personally i suggest trusting your daughter and leaving her alone. not only will it piss her off. but become counter productive to any relationship you had left with her. but that's not my call so i'll tell you what you can do...
in order for you to block something from someone else you must have higher privileges than them. windows does this by having 4 user profiles. Trusted Installer, Admin, Standard User, and Guest.
you can's use Trusted installer because Microsoft doesn't trust YOU with it, so they've restricted your system files so you can't just delete them and make your computer useless. Admin is for you to govern over all other profiles on the computer, and allow usage as you see fit. you must be an admin to restrict anything on a user, so there's no possible way of you both being Admin's because she could override you in that situation.and finally there's guest... no point in getting into it since no one uses it anyways.
so now your an admin, and she's a standard user... you can go into the control panel and set up parental controls to restrict the time, and some other things.
what your probably looking for is a program like (K9) whitch is a website filtering tool. it detects the content upon a sight, and depending on it's maturity can block a user from accessing the page. ( K9 ) i a program commonly used in schools so kids don't go looking up inappropriate things... best of all K9 is free so that's a HUGE plus.
if you want to you can always buy software like this like Net Nanny Parental Control, or McAfee Safe Eyes. but you can't beat K9 for Free
______from this point on is me rambling, and i just sorta got carried away _________________
i bought a laptop when i was 12 years old... i decided i wanted it when i was 8, and i worked for it every day for 4 years. i finally got it after helping lay wood flooring in a house... took up the tile, cleaned it out, and cut the wood. i've never worked harder for something. so i bought it with my own money, took it home. than someone put parental controls on it. not only did i hate them because i had to get there permission to play any game, but it shut off when they felt my time was up... this pissed me off to no end. and i didn't stand by idly. i learned to totally bypass the restrictions, and disable them. when my parents figured that out, they went so far as to DELETE MY COMPUTER and setup everything completely locked down... now you tell me. what do you do when someone goes into the computer you just worked 4 years for, and deletes every single thing on it, and when you log on it says Welcome Heidi (that's my mom)... my computer.... my mom's name WTF.
i'm sorry to say, but that that was it. i undid all there crap on my computer. and i hacked my parents computer. i'm much nicer than them because i saved there documents and pictures hidden in those Trusted Installer System files. but i owned there computer now. when my mom was working on some report thing, i took control. erased everything before she sent it, and shut off her computer in her face. i locked down my own computer so when they touched it all the only screen they ever saw was **** You. it's there fault. all i did was save up for my own computer. i Dare you to find a 12 year old who's got next to a thousand dollars because they worked for it... my parents didn't help me we just didn't have the money, that's not there fault, but dammit, i worked for every penny and bought it myself. why the hell where they taking it away from me. well today i don't give a crap what they think on restrictions because they know they can't do anything. and am basically the god of our network. i've got 24 hour full control over all 5 computers in ours house. both my brothers, my parents. and Mine. it's been 6 years now, and well they've learned to live with it since they don't know how to get it off. and now when my brothers need help they just yell "take control of my computer and fix this"