On what computer operating system are you running Premiere Elements 13? Have you updated 13 to 13.1 yet using an opened project's Help Menu/Updates? If not, please do so.
To your immediate question....
In what Premiere Elements 13/13.1 workspace are you working - Expert workspace or Quick workspace? And, where is this original audio file located
a. one of the unnumbered audio track - and if so, is there audio on Audio Track linked to video in Video Track?
b. Narration Track?
Basically this is going to be a Copy/Paste.
I will give you exact details, once I obtain the above details from you.