The manga consists of 11 volumes + 1 volume called Shugo Chara! Encore,which is 4 "after-stories",and the last chapters of the story.

Amu never charanaries to Amulet Neko,neither in the manga or anime,unfortunately :/

Sorry for a very late reply,but I hope this helped ^^'

Ya! she never charanari into amulet neko. Some says that she charanari it with yoru to transform to amulet neko. Thats wrong
(i think..)! Its only fanarts! And again she never charanari with yoru and tranform to amulet neko. Never~