Yeah we do say "Mom". Whatever the case is with kate and her mom, kate did something to make her mom terrified of her. Hopefully our questions will be answered in the episode where we find out what kate did.

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\"We\'re not alone on this Island and we all KNOW IT\" - John Locke

Locke: Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It\'s never been easy.