According to folklore , tengu fans are usually made from the leaves of Aralia Japonica. To me at least, it looks like she just got a fresh one and gave it a thicker handle
Artist's tags seem to say original Touhou character. Riiight.
This half satori(creature) / half tengu girl is Calidallas' Touhou original character, Hanako. -> [1][2][3] pixiv #36380917, made by Calidallas' friend artist, contains all his/her Touhou originals.