Flemeth: "And so you return." (as she knew you would)
Flemeth: "Lovely Morrigan has at last found someone willing to dance to her tune. Such enchanting music she plays, wouldn't you say?" (she knows that Morrigan has sent the player here to kill her, at some level she's impressed her daughter finally managed it)
PC: "We know your little secret, Flemeth."
Flemeth: "<desc>Laughs</desc> Which one, I wonder?" (a great big laugh, oh this is funny)
Flemeth: "What has Morrigan told you, hmm? What little plan has she hatched this time?" (she doesn't really want to know but she is intrigued)
PC: "She knows how you extend your unnatural lifespan."
Flemeth: "That she does. The question is, do you?" (she knows very well Morrigan has lied to the player)
Flemeth: "Ahhh, but it is an old, old story. One that Flemeth has heard before... and even told." (waving off the details as unimportant -- she knows Morrigan has betrayed her, and since she' s betrayed many others she doesn't really take it personally)
Flemeth: "Let us skip right to the ending, shall we? Do you slay the old wretch as Morrigan bids? Or does the tale take a different turn?" (a bit eager to cut to the chase, "old wretch" said with amusement as it's what Morrigan would call her -- basically she's saying "will you do what Morrigan tells you to or something else?")
PC: What do you propose?
Flemeth: "Morrigan wishes my grimoire? Take it as a trophy. Tell her I am slain." (as if this were nothing, "here take the thing that means nothing to me)
PC: I could do that.
Flemeth: "It's far easier this way, don't you think? The lies are always more fun." (enjoying it)
Flemeth: "The book is inside the hut, with notes and spells enough to make even Morrigan blush with delight." (as if the book is worthless and Morrigan is a fool to want it)
Flemeth: "You and I will not meet again. <emp>That</emp> I guarantee." (enigmatic, said with a wicked smile)
-----OR--------
PC: "Is it true you intend to take Morrigan's body?"
Flemeth: "<desc>Laughs</desc> Oh, I do like that." (she finds this to be very funny -- this is the story that Morrigan told? How cute! Obviously, she's also NOT answering the question)