It is normally necessary to connect to a router by ethernet cable initially to set it up. This is due to the "chicken & egg" situation - you cannot connect wirelessly because it isn't set up and you cannot set it up because you cannot connect wirelessly. Hence the need to use an ethernet cable.
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Does your daughter's laptop have an ethernet port? It doesn't matter which computer is used to set things up. Once configured, connections can be totally 'wireless'.