Yes this can happen especially when filed on your own. Consult with an attorney for guidance.

No as you are not the petitioner on the application.

Yes this is possible given her Canadian citizenship.

Best to wait for correspondence in the mail.

Yes it is possible as you married before the child turned 18.

Yes good faith estimates are sufficient.

Best to have an attorney review the criminal matter to determine if possible.

No unfortunately not under the 3 year rule.

More information is needed but likely deportation thereafter.

Best to consult with an attorney for review of the case. Good luck!