Is it just me or is there no way for that greedy Atris to give you your lightsaber back?
She sais she would give it to you if only you answer her question about the mining station blowing up but after you answer it, she just walks away to cry in her little darkside room of hers and forgets that she promised it!!!!
She didn't forget, she just tricked you. I don't think she ever intends to give it back to the Exile: she's too consumed with anger to perform any charitable acts for him/her, let alone relinquishing the lightsaber, which holds special significance.
Like a lot of other things in TSL, the player decides the color (and shape) of the lightsaber Atris has taken from you. It's set when Atton asks you about your lightsaber (or lack thereof) on your escape from Peragus. In case anyone's interested, the default lightsaber (if you decline answering his questions) is a normal (not double-bladed or short) lightsaber of cyan/light blue color.
"It is all that is left unsaid upon which tragedies are built" - Kreia
After being through the game so many times and trying to use every line of text to get her to give it back, I totally skip that line of conversation now by telling her I didn't come to debate the council's decision. She never even whips out the lightsaber to taunt you. Might as well not be taunted since you can't get the blasted thing anyway.