The CIS processing times for F2A are well over one year, and depending on the foreign consulate, visa issuance could easily take another year. So...

You must show five years good moral character, which includes paying taxes. Go to irs.gov and request your tax transcripts. You do not need to...

If she is no longer in L2 status, it would be ill advised to continue to work based on the L2 based EAD.

it is not likely that they will give you an appointment any faster, but there is no harm asking and it may awaken them so they don't just skip over...

If you have CPT or OPT and a work permit, and it is permitted by your DSO, then yes.

You can stay until August 1 '22 if that's the date they gave you.

An immediate relative, such as a parent of a U.S. citizen, is eligible to file for adjustment of status if he or she was lawfully admitted to the...

An applicant for adjustment of status is expected to stay in the U.S. while the application is pending. One is not permitted to work without a...

Sure. Send them updated documentation and request a new I-20.

Yes, a company can even file an H1b petition for a person who has never been to the U.S., and that is actually normal.