Can she access Gmail over the web? If so, then I suspect that it's DNS-related, where it can resolve some IP addresses but not all. To test this, have her try going to http://208.93.0.128 and see if that works (should take her to LJ's home page).
If she recently installed a firewall or Internet security software and/or tweaked their settings, that could interfere, too. Also, if she knows how to edit the Hosts file, she might want to take a peek to make sure nothing weird is in there that could be intercepting access to the sites she can't reach.
no subject
If she recently installed a firewall or Internet security software and/or tweaked their settings, that could interfere, too. Also, if she knows how to edit the Hosts file, she might want to take a peek to make sure nothing weird is in there that could be intercepting access to the sites she can't reach.