Who is the prophetess in Isaiah 8:3?

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The bible doesn’t seem to give much information for who “the prophetess” in Isaiah 8:3 is. Who is she? Many seem to assert that she is his wife, but cite no evidence to support this.

The word הַנְּבִיאָ֜ה (the prophetess) occurs 5 times in the bible.

1. Exodus 15:20
2. 2 Kings 22:14
3. 2 Chronicles 34:22
4. Nehemiah 6:14
5. Isaiah 8:3

I’m not sure of the time in which Isaiah lived, but I think he was alive in 2 and 3. Could it be that he committed adultery with Shallum’s wife? If so, is it in the nature of God to incorporate sin in his revelation?

Is there evidence that she is his wife?