Problem in getting H4 Visa on passpor

Hello, I got an H1B Visa approval last October and my wife got her H4. She went back home and today she was in the US embassy trying to get the Visa on her passport, and the interviewer told her that all her papers are fine but her Visa is not on the system. What does he mean by that and what should I do?

Information is inadequate.

Was She refused visa or She has been issued 221G ?

What letter did he/she issue her?

Act accordingly