Also, since Martha Stewart was sentenced to less than one year in prison, she was not eligible to have her sentence reduced for good behavior.
Sorry, but I believe you are wrong. The reason she was not eligible for a reduction in sentence for “good behavior” is that the applicable statute (18 USC 3624) only allows for such reductions if the sentence is for more than one year. And, I do not believe that someone getting a “mandatory minimum” sentence of more than one year is per se ineligible for a “good behavior” reduction in that sentence.