"She rarely lies", but she's a sadist and as such wants to inflict as much pain as possible on her captors. You may want to trust her statement about how often these people end in terminal madness, but I won't. She gains too much by the statement. First of all she gains the pleasure of causing people pain. Secondly she furthers the "Let the Lord of Chaos rule" tactic/strategy by saying it. Thirdly she increases her chances of escape, by sowing distrust amongst her captors. Finally she gets revenge on LTT/al'Thor for capturing her by sewing dischord amongst her captors. I repeat myself, you CANNOT trust ANYTHING Semi says

NaCl(especially if it hurts or is harmful)H2O