Are you sure you are going through your wifes computer and then through the router to the internet? Not both of you going through the router to the internet? If you are going through your wifes computer, then hers needs to be forwarded also (that is a strange configuration though, you should both be able to go straight through the router normally).
One thing that could be causing problems if you are both going through the router and even though you have the ports forwarded is if you have not going to a static IP locally, as compared to using DHCP locally.
You didn't mention which router you use. Here's a good page for Linksys which is quite popular:
http://www.linksys.com/tech_helper/advanced.html
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