Get your gran to setup an EL-proxy server running the latest ESG-EL version and route the incoming traffic to the outgoing packets on the back-end, so that local http Protocols get re-directed to her cheaper local only unshapped SAIX based account and Int uses the throttled shapped Express account.
This way she can surf on local unshaped http servers but still be able to access IP's outside of ZA, and backdoor into the Blocked Zones manually by using regular tunneling protocols via the TCP/IP Dialup Net-Bios interface using Packets from her static IP on the bridged network.
Be sure to teach her to ping too, in case she runs into a few problems with this kind of setup.