>>538150793
You are going to miss out on big chunk of damage without phase 3 because the burst is double hit so she gains like 5x damage to her burst skill compared to non-treasure.
S2 is where most damage comes from and s1 is the skill that procs it like crazy.
So 7/10/4-10 depending on treasure level. Phase 2 should be fairly easy to get since you need 50 materials.