Hey, comrades, my fiance will have an interview in one or two months. Just want to know what she needs to bring with her.
The guide states that I need to send to my fiance "Send all originals of the documentary proof that you submitted for the I-129F to your fiance(e) for their interview at the embassy." What specifically is that?

And for the affidavit of support, do I need to send the originals of the tax returns, pay stubs, and life insurance policy, and stock receipts?

1. It is the originals of the documentary proof you submitted for the I-129F. Usually that means you sent copies with the petition. They can ask to see the originals so you have them in the hands of your fiance at the time of the interview.

You send copies of supporting documentation with the affidavit of support. The affidavit is an original and notarized.

Thanks, what about my social security card, driver license and certificate of naturalization? I can't send it to my fiance. She can't bring it along with her to the interview.

The SS card and drivers license were never needed. Send a copy of your certificate of naturalization or you could have a copy of every page of your passport notarized and send that. The idea of "originals" is that they could ask to see them but they usually don't. You just do the best you can. A lot of things are a judgment call.