What happened to zuko's mother?

Answer 1

The most we know about Zuko's mother is that she was banished. The back story is that Azulon, Fire Lord before Ozai, commanded Ozai to do the unthinkable to Zuko, most likely kill him, and Ozai was going to do it. When Ursa found this out she committed high treason. It was not clarified what she did but you are led to believe she killed Azulon in order to save Zuko. For her actions Ozai banished her. She was never seen or heard from again. She may be alive and she may not. The very last episode implies that Ozai knows where Ursa is when Zuko asks him where his mother is. It is never confirmed wether she was alive or dead or wether Ozai really did know where she was.

There was on episode that had a vision of zoku's mother. I believe she was banished to the spirit world.

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Yes it is true she is banished...also she is alive. In the comic strip the promise, it is said Zuko sent Jun and her freaky mole thing to search for her, but she was nowhere to be found. Now in Avatar aang when they searched for Aang he was also nowhere to be found but he was just like in another world. So it may be possible Ursa is in the spirit world or she might be in the place Aang was in. I mean she's kind to animals so there is possibility she's on a giant lion turtle.