Let me explain it for you:

The Australian radio hoaxers are part of the plan. They performed the hoax only as way to give to the public opinion a plausible excuse for the nurse to "commit suicide".

They KILLED that nurse for ANOTHER reason.

They killed her, because she witnessed some VERY WEIRD things in that hospital, regarding that THING that Kate has in her womb...

The nurse saw something very scary about the reptilian/satanic "baby", and THEY needed to "eliminate" her.

So, the "hoax" was just to give a plausible excuse for her "suicide".