In her life, she was a worshiper of Lunos and the main caretaker of a temple dedicated to her deity in Conyberry. When the Blue Boar Tribe attacked Conyberry, it was her idea to smelt all the town gold into a bell and then disguise it as a humble copper bell for the church.
When The Phandalin Four met her in Conyberry after scaring off some orcs that were taking refuge in the village ruins, Agatha used her ethereal gift of clairvoyance to answer one question the group had for her. Jard asked about his missing love, Lily and if she moved on from him. Agatha said that she is still waiting.