There is no general bar to admission to the U.S. based on one being barred from admission to a different country, including Canada.

There is some risk you could be put in secondary inspection. Otherwise I do not see any issue.

If they can show that there are insufficient U.S. workers for the position, they can file an immigrant visa petition for you.

It depends on how you became a parolee, and when, and a lot of other information. Most likely you need a waiver to return to the U.S. as well.

You can send the '21 tax return and indicate the income for '20, and '19.

Call Customer Service and give it a try!

You could show up and ask to proceed without her. CIS can choose to waive an interview. If you wish to file an i-140 self petition for an Eb2...

You can stay out for the rest of the H1b if you wish. Regarding taxes, you should contact an accountant.

Requesting to recapture should not change the processing time.

Yes, you must contact them and check why they are not getting what you sent them.