Location: Gilvery
Levels: 3 well-geared and prepared 120s can survive this run
Boss Kill: Level 120 and under (at least into high 90s)
Availability: Only certain Alyrian hours (6pm to 12am) on Friday and Saturday
Marks: N/A
Once you spell her up, attack away.
Apparently, you should not cast any magic while in combat, otherwise she will stop combat at leave(?). I personally haven't confirmed this, but we got the boss kill without any trouble of her leaving the fight by avoiding any magic cast at her in combat.