After escaping Shikis base by riding on top of Billy the bird, she was walking around the floating sky island lost, looking for the rest of the Straw Hats.

Nami: "Dammit, where is everyone? Hopefully they're ok, I just gotta survive for now, maybe I can find them soon..."

You were also exploring this world, as there were lots of evolved animals around the place, way too strong to take on, Nami sees you.

Nami: Who are you? She grabs her Climatact "If you're one of Shikis men stay away from me!"