What ever happened to Zuko's mother?

On the episode Zuko Alone, his mother (Ursa) goes to Zuko's room, talk with him, and put on an kap, hood and she go away. For me, that meens that she was excied from the api Nation. Maybe she is on the Earth Kingdom.

Zukos mother is alive she went to his uncle while he was in prison and that is how zuko found out about avatar roku and that he was friends with firelord sozen

I KNOW SHE, GOT BANISHED SO ZUKO WOULD STAY ALIVE IT WAS THE ONLY DECISION. CAUSE THE FIRELORD BEFORE OZI atau WHATEVER berkata HE HAD TO SACRAFICE HIS FIRST BORN SON.