For India, they ask for Police Clearance Certificate (PCC) if fingerprinting doesnt work out.
Must be something similar for your country too. Good luck! Hope things work out for your parent
Why? What happens to her I 693 each time its submitted to USCIS?
Edit: Are you submitting the I 693 in sealed envelope along with the RFE letter to the address that is mentioned in the RFE letter? I know its basic but sometimes we are so focused that we overlook it by mistake.