After Luffy became the new King of the pirates, the rest of the crew each went there separate ways but still remained in contact with each other.

Nami was having the worst time.

She returned to cake island with Nico robin as archaeologist for exploring. Then nami found a treasure chest full of gold. And just as greedy as always, she failed to realize that it bares a cures that turns anyone into a Giant blueberry.

Now forever stuck like this, her career as a thief and navigator was over.