You should help the people of the Starkmoor before moving south to meet Nona in the Dunbog.
'The people of the Starkmoor are on the tipping point, ${PLAYER}. If we can help its people, we may be able to deprive Saruman of the food he needs to feed his armies.
'Travel south to Avardin and help the people there and all throughout the Starkmoor. It may prove the difference in this region.
'Once you are satisfied that you have done all you can to help the people of the Starkmoor, I will meet you where the road passes from the Starkmoor to the Dunbog in the south by a great stone arch, and we will continue our journey together.'
Nona is along the road that runs south out of the Starkmoor into the Dunbog, near a natural arch of stone.
Nona has asked you to help the people of the Starkmoor with their problems, especially at Avardin to the south, and to meet her by the road into the Dunbog when you are satisfied.