We see Fiona dead before we know what happens to her. Ohm finds her in the dumbwaiter, dead in her bunny costume. We find out later that she was having an affair with the married manager, Mal. Mal wasn’t happy she was pregnant and wanted to keep it, so Mal drugged her and carried her into the dumbwaiter.
You don't see what happens to Fiona, but you sure see her dead.