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Nesephise recalled her past, and a time when he ended drifting ashore in this continent after she had gone to fish deep into the swamp ocean, ending up in the middle of a storm that brought her here.
Her theory was that she survived thanks to her frog totem spirit, which wasn't as strong as it is now, but that was strong enough to at least save her life. As she is an amphibian, she can naturally breath underwater, so the risk of drowning wasn't there, but she could had still hit herself in the head and die, or have her body crushed through turbulence, or get eaten by a giant fish, amongst many ways to die.
Because of this, it was rather obvious that she could had died if things would had gone awry, thankfully, since she was a child that she had the help of her totem, she was after all someone blessed with such a power, a power that might one day bring a change in the entire planet of Amphibi.
Check "The Protagnist's Sister Is Actually the Strongest"!