then read again, nothing say there was a body, only what she was sitting there, take this "but" in the account
"My parents bodies were identified but not my Sisters, but she was sitting between them with my Mom holding her in her arms. That doesn't leave much room for doubt."
after the crash they found bodies and pieces all over (plane fucking crashed, bodies wasn't still sitting in their places), identified all family members aside from sister (using said bodies and pieces), then MC says where she was sitting during flight and guesses since everyone else is dead around this spot - she is too