they prioritised spectacle over decent writing and characterisation.
She claimed and thought that she was ready for absolute power. She wasn't.
She claimed and thought that she would've been absolutely loved. She wasn't.
She claimed and thought that she had extreme power of life and death. She did.
The three elements above explain the "snap" that built up over a series of years.
There is no spectacle in what happened (ok, the fire...), only extreme sadness and pain.