Then if your daughters PC/Laptop hasn't already got a wireless card then you need both a router and a wireless card, preferably the same make.
http://www.ebuyer.com/customer/produ...duct_uid=45621
and this
http://www.ebuyer.com/customer/produ...duct_uid=75646
Would do the job nicely if she has a laptop then substitute the second item for this:
http://www.ebuyer.com/customer/produ...duct_uid=45581
But there are many other makes and combination, a good look around ebuyer or dabs may help you decide on a brand and model.