For the interview, she needs to bring her passport, recent passport photos, the police report from her home country and any other country she has lived in since she was 16 years old, the marriage certificate, your divorce decree, her birth certificate, possibly a certified translation of her birth certificate( if her interview is in a country other than the one she was born in) photos of the two of you together ( if you have photos of the two of you with family, even better) past plane tickets or itineraries of your in person visits since marriage. ALL LEGAL DOCUMENTS NEED TO BE ORIGINALS.
You DO need to upload your divorce decree to the CEAC portal and she will need to present the original at the interview.
What consulate will she be interviewing at?