She's in jail, not prison. I wonder this: if at the end of her 120 days in jail for civil contempt, she is brought before the Grand Jury again, and asked the same questions, and she refuses to answer, would the judge charge her with criminal contempt, as he has said, and then order her to serve that 180 days in PRISON?
You see, prison is a whole 'nuther world from jail. I've visited both a number of times on assignments and they are day and night different. Miller might think she can handle jail for a 180 day sentence, but if they put her in prison, maybe she'll see things differently.
Po-tay-to. Po-tah-to.
Either way, incarceration is not a sufficient motivation to compel her to divulge her source. She is being well compensated for her inconvenience by her Big Media masters. Moreover, she will use her time behind bars to her advantage; it is definitely raising her star among her socialist Big Media brethren.
Even if she gets sent to full-on federal shower rape prison, her Big Media masters will simply up her compensation for her additional inconvenience.
As long as she is backed by a wealthy media corporation, incarceration is not a sufficient compulsion to to reveal her source. The only way to hit large corporations is through their pocketbook. Someone here mentioned simple $1000 fine that doubles every day she withholds her source's identity. After 30 days, that would grow to over a trillion dollars. No corporation is wealthy enough to bankroll that.