And here I was thinking that Ama wore that cat-shaped hat to cover up her demon ears.

It could be ama...since its a sequel to shuffle.....but ears...where'd they go...that makes me think its a new character

It is Ama, They redesigned her character in Really?Really!

This is an image of Ama from one of Kaede's false "memories" in the game. Kaede never learned Ama's secret in her path from the original game, so she is just imagining what Ama looks like without the neko hat.