I am trying to ground my daughter from her laptop, but don't want to physically take it. I am running windows 7, but I don't see where all the computers in the house are listed. I thought I could just remove the laptop. She has windows XP. I'm kind of having a hardtime figuring out the network (and windows 7 workgroup) but I eventually got them to connect and share our printer. 2 XP's and a Win 7. Any ideas? Here is some additional information you need to have. I mean about Windows, not your daughter. I could talk an hour about children and not say anything you don;t already know. Let's stick  just the technical stuff.
Rather than do something over the network, you should get direct physical control of her Laptop.
First of all, there is an account for the real administrator of a Windows XP system. It is called 'administrator' and ought to have a tough password. In XP  Home version you have to strut in safe mode to get it.

Presently in Windows XP and in other versions of Windows there is a thing called policy. ALSO, users can belong to different groups. This allows the chief administrator to degrade the privilege of a user by putting him/her into a limited group.
This is most readily done  directly on her laptop. It MUST be done by the  real administrator of the laptop, and he will create new user account with reduced  privileges or move a current user into a new group.. The default settings for Windows XP cannot PROVIDE very fine grain levels of privilege. You have to create a new policy for a group of users. A group can have just one user if need be.
For more information on how to do this you will need to look through articles found in the Microsoft knowledge base.
These articles are for Windows 7. There are similar features found in Windows XP. You can browse and search at http://support.microsoft.com/ and find more specific articles. Or http://windows.microsoft.com/ is another MS data base.

http://windows.microsoft.com/en-us/windows7/Why-use-a-standard-user-account-instead-of-an-administrator-account

http://windows.microsoft.com/en-US/windows7/How-do-I-change-the-behavior-of-User-Account-Control-by-using-Group-PolicyIf you want to ground her from using the internet on the laptop, you can reset the router to use Mac Filtering. Then you can add or remove the laptop when needed. She won't be able to change it from the laptop since it requires a wired connection.

http://netsecurity.about.com/od/quicktip1/qt/qtwifimacfilter.htm

This should not be your only security, WPA2 will keep the network safe and Mac Filtering will keep your daughter offline.
One thing you can do is disable the network adapter.
You can go to the Network Connections folder and disable the network adapter.
1. Click on Start and then Control Panel
2. Click on "Network Connections" or click on "Network and Internet Connections" and then click on "Network Connections" from there
3. Right click on the network adapter she connects from, and then click disable.

I recommend disabling both the Wireless and Wired adapter, so then she can't connect.
When you're ready to enable the network again on her laptop, go back to the network connections folder, right click on the disabled network adapters, and click "Enable".