The problem here, as I see it, is the commonly held belief, "When you shoot an arrow of truth, first dip its point in honey." She's used to people who are not so blunt. The average person, it seems to me, would accuse someone of being a liar with the words you used. She needs to understand that if you're going to call her a liar, that's what you're going to say: "You're a liar." or "You lied."
Ah, once again, "social graces" cause misunderstandings rather than bringing people together.
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"Let reason be your only sovereign." ~Wizard's Sixth Rule
I'm working my way up to Attending Crazy Taoist. For now, just call me Dr. Crazy Taoist.