After you saved Meregyth from the Boar-tribe Orcs, she went to Beaconwatch and waits for you there.
'Now that you have cleared a path through the camp, I think it will be safe for me to leave.
'I will travel to Beaconwatch, as it is nearer and more heavily fortified than Fenmarch. There is a spot near the Mead Hall that overlooks Firienwood. I like to go there when I need to be alone.
'Beaconwatch is just down the road to the south. Meet me there when you are finished here.'
Beaconwatch is south along the road.
Meregyth told you to meet her at Beaconwatch.
Meregyth might be found near the Mead Hall of Beaconwatch.
You have found safety within the fortified walls of Beaconwatch and should now seek out Meregyth to ensure that she arrived safely.