1. Don't use Dlink, they seem to give nothing but trouble.
But if you have to....
Find out what IP range your wireless router uses (usually between 192.168.0.1 - 192.168.0.255) and then set enter the routers et-up section and set a fixed IP address for your daughters computer. (If you're not sure how to do this, reply with the make and model of your router) Next, go to your daughter's computer and assign the same IP address to her system, this can be done by going to control panel - network connections - right click on wireless network connection and then choose properties - select Internet Properties (TCP/IP) and select properties - then click on "Use the following IP address" and enter your information there.
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