Chisa is a havoc Negative status support.
She's meant to be a 3rd slot/support.
Sn 0 her damage is ok but if u wanna get her to the next lev get her s2/s3 is Good.
She if you want some weapons, the best is her signatur providing her with crit states & Negative status dmg bonus.
You can use the other weapons in the pictures above as stat sticks.
For her Echoes you want if sig, 4 cost: crit dmg
3 costs attack & havoc dmg, 1cost (attack ×2)
She can rock a rejuvenating glow with same states. You want to keep in mind tgat for more healing ditch some crit and get 4 cost attack if u don't care about her dmg.
Thank you for your support.