Your mother was ill prepared for her interview. Quit whining and enroll her in ESL classes. You are not doing her any favors. You are a poor representative of an American citizen by expecting your mother to be granted citizenship when she has been deemed unqualified.
I suggest that you look for a social service agency that assists immigrants and locate an ESL class near you. Check with the local community college. Since you say she can read English and has trouble with spoken language, a conversational class is best. Also, have her listen to Sesame Street and other children's programs that integrate the written and spoken language. These suggestions will benefit her more than you spending time blaming others for her failures.

