Kanna dies in Episode 11 of InuYasha: The Final Act "Kanna's Gravestone", which if you add it to the episode count of the original InuYasha anime would equal Episode 178. Though The Final Act moved through the rest of the story at a faster pace than if the original anime had continued, it would've probably occured at a later date than 178.
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inuyasha episode 128
Episode 2 of Inuyasha: Kanketsu-Hen
Episode 18 of InuYasha the final Act
episode 100
It is episode 13