Depending on the Writer: Even taking last episode into account, all of the characters get hit with this bad. But Nadia gets the worst Flanderization of the bunch.
My Friends... and Zoidberg: Nadia excluding Jean from the beach's name, justifying it would be hard to say.
Naming Your Colony World: By herself, Nadia decides to give names to several landmarks of their new home. The island itself is named after Abrhaam Lincoln, the inlet is named Captain's Creek because of Nemo's cabin and the beach is named Namaki, from Nadia, Marie and King; she didn't put Jean (for Najamaki) because it would be hard to say.
O.O.C. Is Serious Business: As frustrated as Jean is with Nadia complaining about being rescued, it's a sign of how bad and stupid this particular complaint is that Marie of all people blows up at Nadia.
"The Reason You Suck" Speech: Marie tears into Nadia after she whines about fishes not coming to save her, complaining Jean and Marie made them unhappy by fishing them. It makes Nadia snap out of her misanthropy.
Shout-Out: Nadia naming the place Lincoln Island is another Jules Verne tribute to The Mysterious Island where the castaways name it Lincoln Island too.