I can verify that the method in post #2 above did work. However, after reboot, SuperSU sent a message that it had stopped. I checked and it was installed. So I went and updated SuperSU to the latest version (v1.94) via the market. I then went to SuperSU settings and installed it into the system. I now had root access and SuperSU was running properly. I then installed NextApp SDFix from the market and enabled writing to the external sd card. All is good now, her phone has root access and her apps can now write to the external SD Card. Thanks to all for your help.