Leliana's Past

Walkthrough

 * Get enough approval with Leliana that she tells you about Marjolaine.
 * Have a random encounter while traveling where you confront merceneries hired by Marjolaine
 * Go to Denerim
 * Enter the building where Marjolaine is.
 * Confront Marjolaine via dialogue.
 * High difficulty encounter where the party fights Marjolaine and some mercenaries
 * Loot a bow name Marjolaine's Recurve from a nearby chest

Journal Reads
Marjolaine mistakenly believed that Leliana's reason for emerging from the cloister was to exact revenge on her. She made the first move, sending men to kill Leliana. Marjolaine could not be allowed to hound Leleiana, so you killed her.

Possible Differences

 * It may be possible to confront Marjolaine without killing her with high coercion but these results have not been verified.