Chiori is an off-field damage dealer focusing on her automation dolls (Skill DMG). While there is an incentive to play her in teams which have a Geo Construct (pre-C1), she is still a good option even in Geo teams which do not have a Geo Construct (such as with Navia).
Regarding Weapon Choices:
Harbinger of Dawn: Ranking is assuming the passive is active. Chiori can usually have good uptime on the passive as she is primarily used as an off-field character, along with having good synergy with certain Geo characters like Zhongli who provide a shield. If using Furina however uptime may be problematic depending on how strong your teamwide healing is, or if facing enemies where corrosion is present.
Cinnabar Spindle: Ranking is assuming one doll. This weapon performs slightly worse than [R5] with 2 dolls.
Mistsplitter Reforged: Ranking assumes one stack on the passive.
Wolf-Fang: At [R5] this weapon performs close to .
Regarding Artifact Choices:
Sets
Golden Troupe (4): Outperforms (4) if you are ignoring Chiori's Burst completely. (4) can outperform (4) if you are using Chiori's Burst more frequently.
Substats
Energy Recharge: Chiori is not Burst reliant and can opt to Burst less often. It is not recommended to build ER% at the expense of offensive stats. ER% gains in value at [C2]+ when Bursting is needed to summon an additional doll.