Direct Conect Behind Network. Possible?

[XxIcexX]

Im trying to send my girlfriend holiday photos, through limewire with Direct Conect. I have a dialup so its the easiest way really...

My setup is straight 56k Dialup into the wall.
Her setup is, she has a host computer plugged into DSL Internet into the wall, then her computer is wireless networked to the internet through this computer. She has a little chip sitting on her computer to recieve the signal and all

We have sent the file to 46% then i had a problem and it disconected, and now cant conect to each other again.
It says on hers, Windows firewall is either blocking this, or this computer is conected behind a router.

Am i right saying it is actually conected behind a router? since her sisters host computer is the host. And if that is right then there has to be a way around it cuz i conected and sent 46% of it. I just dont know how i did it lol.
So how do u find her IP address on her computer, and once i have it how do i conect around the router? Its not really a router but its a network so i dno...

I know its a mouthful but id really think it were quite simple lol
Thanks for any help!
Ice