If you/she want to 'borrow' a wireless signal from a neighbor, why not just ask for their permission?
Asking for help to do something illegal on any public forum is frowned upon simply for the fact that it is illegal. If someone here were to give you that information, Anandtech could be held responsible for any criminal activities (breaking in to someone else's network without permission is a criminal act, even if it is 'just' a home wireless network) you performed with that information.
I can understand that she might want to make use of an existing connection, particularly with no phone line in the house, but is the risk really worth it? Particularly when she could probably get a phone line, or even a dedicated broadband DSL or Cable connection installed there with very little difficulty. (If the neighbors have it, she should be able to get it, too.)