>>538087275
If you really want to boost her power, I'd recommend just going for the C1 but you should always roll for who you like, so save your radiance if you'd rather have a new character.
>>538087283
Ineffa is a very handy teammate for her too. I like characters with lots of options instead of getting pigeonholed in the same team with the same 3 units.

>>535486663
Good luck.

>>534324859
Citlali was the more useful one there, since my initial set up was Chasca with Ororon/Bennett/Furina which kept coming short. I swapped out Ororon for Citlali and cleared with relative ease. Escoffier is really just there for the extra off-field Elemental app and to give some minor res-shred. I think you could easily swap her out for a different PHEC off-fielder and should be fine as long as they're holding like NO or TotM or something.

In Citlali's case, I think you CAN do it with C0, just make sure Chasca is always floating right above Papilla so Citlali's AoE attack can hit it too.