If I'm understanding you, you can ping from her computer to the router and to the public Internet, but you can't actually access email or the web?
If that's the case try and see if you can get to the Net from her computer using directly an IP address (google, for example, can be loaded at
http://72.14.207.99/ ) If you can get to Google using the IP but not by typing google.com, then something is wrong with resolution of DNS in her local computer (not in the router or the DNS server, otherwise it would also affect your computer.)
If she cannot ping the public Internet or her router, there might be a DHCP problem with your router, in which case, disconnecting her computer from the router, turning it off, then reconnecting it and rebooting might solve the problem.
If it's none of those, I would point out that we are still in a Mercury retrograde, and equipment fails for no apparent reason during retrogrades, and the problem will most likely go away after July 10th. Sounds really airy-fairy, but my experience is that these weird things happen during retrogrades and not at other times.
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