You can, but must be mindful in your tax filings that it's passive income/hobby.

You should primarily rely on the I-797 receipt for Company A but still provide an explanation for what happened with Company B in your I-129...

You can try using NVC's Public Inquiry Form to advise them of the address change.

They should be able to file the I-485 if the priority date on the I-130 is either current or is before the cut-off date on the Visa Bulletin.

I think this is more of a family law question.

Besides B1/B2, one of the many alternatives is to see if she can qualify for E2 visa by being a treaty investor.

If you are still in your grace period after conclusion of OPT, and if your employer files the H1B and requests Change of Status, you may be able to...

This is a gray and debatable area where most attorneys probably can't give you a definitive answer in an open forum.

You need to consult an attorney because there are several issues at play and some facts are missing. Good luck.

Easiest way may be to write to NVC through its public inquiry form.