8老师I really appreciate your help! can I ask one more question?

8老师：I really appreciate your help with my question yesterday! You are such a kind and knowledgeable person! 

Can I ask one more question regarding birth certificate? My mom will provide her 出生公证书。However the requirement from U.S. Depart of State says: "Notarial certificates of birth are best used in conjunction with other evidence." 

Can you please tell me what other evidence my mom should provide? Can she provide A letter from a company she worked for more than 10 years?

Thank you very much for your help!