So whos the girl at Radanh's festival?

[Dollmaker]

The one that gives you the Polite Bow gesture, she just kinda there....

At least we can get some lore from the other NPCs, but havent found anything about her, just curious

[ZTL-Altima]

Only thing I know is what is written on her ash:

"One of Seluvis's puppets.

Use to summon the spirit of the Finger Maiden Therolina.
Spirit of Finger Maiden who never met the Tarnished she was
meant to guide. Uses healing incantations and Holy Water Pots,
but she is not a fighter by nature and is ill-suited to battle.

A Maiden without a Tarnished. A Tarnished without a Maiden.
And yet no guide to bring them together."

[SmallGespenst]

yeah, it's Therolina, you can summon her during the fight.