>>103685144She was never the Earth Queen, what fucking show did you watch?
She posed as a Kyoshi Warrior, got the Dai Lee to help her coup, and then occupied Ba Sing Se with the Fire Nation army.
She never had access to the entire Earth Nation military, they stood down after losing their generals, their King, and their capital city.
Also the Earth Nation isn't as powerful as the Fire Nation, that's why they had to turtle up in one city.