Note: The player may already have acquired Merrill's Questioning Beliefs at this stage, but if this is the case, this quest will trigger first.
If Hawke kept the Arulin'Holm, she berates Hawke for breaking their promise and hampering her efforts, stating that she is fulfilling her duty to her people.
If you gave Merrill the arulin'holm, you net Merrill: friendship (+5) for the Diplomatic choice.
If Hawke gave her the arulin'holm, they also have the opportunity to flirt with Merrill here, and if her friendship or rivalry is high enough, she will meet Hawke after the quest at the Hawke Estate at the end of the following quest. Note that this flirt is not required by any means, as any will be sufficient to send her to Hawke's estate, including the Flirt option available in the next quest.