Merrill, Friend or Foe? is a companion quest for Merrill in Dragon Age II.
Acquisition
After completing A New Path, you will find the quest in your Journal.
Walkthrough
Travel to Merrill's Home and talk with her about what happened.
Results
Ensures her loyalty for The Last Straw.
Bugs
If you try to change your party, Merrill will be locked on and you can only choose 2 other companions. If you travel back to the Hawke Estate and re-exit the problem is solved.