Her debuffs are great for physical teams, but there's a lack of physical DPS units so she can only do so much.
Completely functional at V0 but if you want more DPS then u must invest into dupes, this is fine though cause she is the first new standard doll. But I think you will get more value from Qiongjiu and Tololo dupes.
Recommended keys
Key 2. All-In Slash
Key 3. Rescue Response Supplies
BiS weapons
Hestia (signature SSR)
Papa-Figo (battle pass)
Should I get dupes?
Standard doll but Tololo and Qiongjiu are higher priority so not recommend to get her dupes. At V5 she can do decent DPS.
Expansion Key
More damage and synergy with Yoohee and Lainie. Good DPS boost so get it IF you already have a v1 Yoohee.