FOIA requests have already established that the State Department (during her tenure) was aware of arms being shipped from Benghazi to Al Nusra in Syria. The names of the parties involved have been redacted (meaning it was likely us, or our "friends"). So yes, it is in there.
But since so many Republicans are for arming these people too, I wouldn't expect them to focus much on it. And supporters of Democrats don't care what their people do, just so long as they aren't Republicans.