how was kaguya defeated??

[LOCKKO REE]

hogoromo said to kaguya hey look mom there is one chakra fruit in this drum!!
Kaguya: take a side you son of a bit*h (never realized she was his mother ) i will take that
she just bent to look into the drum then both brother pulled her legs and drop her into the drum and closed it
that drum was actually Kohaku no Jōhei the sealing drum!!!
Hope this clears the picture XD

 

[VongolaX]

Hagromo and Harume did it obviously.

Look at her reaction when she saw Hagromo's sun and Haruma's crest on Sasuke/Naruto's hand.

She was greatly displeased.