one of my closest friends admit she's a cleptomaniac...what should i do???

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we have been friends since grade school so i can say i know her so much, so what i thought, but 1 day she just sit beside me and tell me that she is a cleptomaniac, sobbing she said she doesnt want to be, but cant help it taking others thigs cause it really gives her satisfaction, and fun, i told her to consult a doctor but she said she dosnt want someone else to know her dirty little secret, what should do to help her???help me guys pls...