Can you be more specific about the actual symptoms manifesting where you state "Client has been unable to access" ?

Blank screen?
Kettle sings instead of website appearing?
Actual error message?
Using what software? a browser? an FTP app? something else?

These dial-up and satellite connections ... are they being initiated directly from the PC? Or from some sort of device that's doing the internet connection and sharing it with her various computers in her home network?