There is no U.S. law that precludes you from working for your US employer from outside the U.S.

While it may be nice to submit it, I don't see any need to do so, nor any harm to do so. So you might as well.

It is not a problem, you can do that if you want.

No, there is not an automatic warrant to arrest Visa Waiver overstays. However DHS can simply deport you and does not require any order to do so.

A lawyer can help make arguments on your behalf. But if there is no legal basis to terminate proceedings, and you do not meet any prosecutorial...

You could apply for ESTA. You could also request the U.S. consular office to reissue your immigrant visa, depending on the visa type.

Check the alien number with the online system at https://acis.eoir.justice.gov/

Perhaps you could get a nonimmigrant visa waiver. But you should assume it will not happen.

If you continued to pursue the application, it should be covered by CSPA.

Her mother could have filed an immigrant visa petition for her, and she still can do that. Your sister will need to leave the US and return with a...