In order to be a part of the OneCare Circle and use the OneCare Printer Sharing feature, her copy of OneCare would need to be activated with your OneCare Subscription LiveID.
However, you can still share the printer manually using Windows Printer Sharing.
Open OneCare on her PC and the PC that is hosting the printer (where it is attached.
Click Change Settings
On the firewall tab, click configure firewall
If the network is shown as Public, click Change Location to change it to "Home or Work."
Click the Advanced Settings button
Click Network connections tab.
On the Ports and Protocols tab, add, optionally, a check mark next to File and Printer Sharing - for subnet and Internet if the first setting alone (after all of the above are verified) does not allow Sharing to work.
On the PC hosting the printer, go to Control Panel/Printers and right click the printer you wish to share. Select Properties and then Sharing.
On your daughter's PC, go to Control Panel/Printers and select add a printer and select Network printer to see the printer that is shared by your PC using Windows Printer Sharing.
-steve
