I suppose you have run the network wizard on each pc,and enabled file and printer sharing.
Now go to the main pc, Click start > printer&faxes > right click printer icon > sharing > tick share this printer(give it a name if you want to) > ok > now you should see a hand beneath the icon.
Now on your daughter's laptop, Click start > connect to > show all connections > click my network places on the left > click view workgroup computers > double click the main pc's icon > double click the network printer's icon.
A message will warn you that you're about to install the printer driver,> click install > then a bar will appear beneath it showing it's networked.
You can repeat the procedure on other pcs if needed.