Fools Rush In

Fools Rush In is the prerequisite for recruiting Isabela.

Acquisition
One must first speak to her in the bar, The Hanged Man,and witness her being confronted by Lucky and his gang. After she will as Hawke to provide backup for a duel she has set up with an old acquaintance who she fears will not play fair.

Walkthrough
Her acquaintance is Hayder, who has set up an ambush for her in the guise of a duel. After the ambush has been dealt with, Isabela instructs Hawke to check the bodies for information on the location of Hayder. When the not is found, his location is revealed to be in the Kirkwall Chantry.

After making their way to the Chantry through more of Hayder's men, he is confronted and reveals that he is forcibly inquiring Isabela on the location and status of the Relic. When she claims that she lost it, a confrontation culminates with the death of Hayder.

Result
With Hayder's death, Isabela reveals that since Hayder cannot inform Castillon, their employer, about her lack of progress with the relic she will have to acquire it one way or another. This leads to Isabela joining Hawke's group.