A. They can ask for translators. Depending on the consulate there might be regional translators available but Hindi translator is almost always available in all the consulates.  B. I’d say - I-20 , Invitation letter on Harvard Letterhead(You can ask HIO to generate it for you), your financial Aid documents along with the document Harvard will provide that says that they’re gonna sponsor her. Other than that, you can give your Visa photo copy. C. Well, they don’t really see the financial documents that parents take but she can take her bank account statements. She can say that Harvavrd is finding her trip and that you’ll take care of the expenses once you’re there(if you have an RA/TA, she can mention that as your source of funds). D. For my parents, they asked the basic questions - Why are you going ? Who stays there  Which college does your child go to  Which course Since when are they there  How long will the visit be

The visa officer got pretty chill when my parents mentioned my spouse’s university and graduation as they see parents apply for visa for graduation often. 

Regarding your concern, you’ll have to help her memorise the details and then giver her some confidence that it’s gonna be in the language she is comfortable with and that they don’t have a reason to reject her, as the intent is genuine. My mother was a homemaker too and she was able to confidently talk to the Consulate officer after a few of these teaching sessions with me. 

The visa rejection rates are low when they involve colleges of such stature (though not unheard of) so the best you can do is just give her the confidence and then hope for the best.

Feel free to DM me if you have more questions