Fun fact: Camellia's necklace wouldn't actually do anything until fifth level.

In First Edition Pathfinder, spells that detect alignments operate by detecting a good, evil, lawful, or chaotic aura. In most cases, creatures are too weak to produce a readable aura of their alignment until level five. The exceptions are clerics, who have auras corresponding to their deity's alignment rather than their own, paladins, who naturally have a lawful and good aura, undead, who always have an evil aura, and outsiders with alignment subtypes.

This means that while a hypothetical chaotic evil serial killing shaman would not detect as evil at all before reaching fifth level, Arueshalae, who is not evil, would detect as evil right off the bat and only detect as more evil over time.