The tax returns, W2, 1099, pay stubs, employment letter, etc. Refer to the I864 instructions for guidance.

Yes this would be the beneficiary’s address outside of the US.

Depends on the nature of your previous stays in the US.

You may apply in August 2023 based on information provided.

Yes it is possible it will be approved without interview.

The I94 stands and is the legal period she can remain.

Best to speak with the lawyer you are working with.

No not with just the filing of the I130.

It appears the answer is no based on information provided.

Yes if no payment was taken and no correspondence with USCIS, best to contact them to inquire.