According to Quran (6:124):
But Allah knows best where to place His Message
you see that Allah chooses Prophts or Imams to deliver his message. And according to Quran (53:1-4):
your companion is neither astray, neither errs,nor does he speak out of desire. Indeed it is not except a Revelation which is revealed
it is God who directs prophet to do ...
It is definitely wrong.
Shia believes After Fatima Al-Zahra (Salamullah Allayha) passed away, his husband Imam Ali (Allayhe Assalam) washed her body at night (gave her Ghusl) and buried her at night. In one narration Imam Ali (Allayhe Assalam) dug 40 graves for her so that no one discovers her grave and it remains unknown till now.