"Specialises on the history of Falador and sent by Varrock Museum to uncover the secrets of the chest. Talk to her for more information about the event."
Darla was sent to the Falador park by the Varrock Museum because she is in expert in the history of Falador. She is asking for players to help her dig up treasure chest in the park to learn more about King Raddallin, she will give you 100 basic tools each day (from the 22nd until the 26th of October 2015). One can buy additional basic tools from her with loyalty points.