I’m gonna get a green card?

Jurisdictionally, your case is with the immigration court, and not with USCIS. Therefore, you will not be able to be a part of your mother’s case with USCIS unless your case is terminated or remanded by the court to USCIS. You can go to the interview with your mother, but the USCIS officer will likely tell you that he or she can do nothing with your case as long as it is within the jurisdiction of the court. Assuming that you have a legal representative, that individual could then speak with ICE attorneys to see whether they would be willing to join in a motion to have your case taken out of the immigration court. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.