I have the SMC.. lemme remote connect to home and double check something.. i beleive the SMC has MAC filtering.
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I thought it did.. but unfortunately has only keyword/URL blocking... nothing beyond that. :(
Really, what you would be looking for, is something with MAC filtering on it.
Not sure, if any of rogers gateway offereings have that built in by default (the cisco didnt.. the CGN3.. might?).
You might have to invest in a 3rd party router, which has more advanced features, like the MAC filtering.
What MAC filtering will do.. is that EACH wireless device, has a UNIQUE MAC address.
With these mac addresses.. you can can make an 'allowed' list. So only ones on this list, are allowed to connect. You would add the laptop, any other wireless devices you might have, and just exclude her other.