Not much, it seems. Large criminal cases, such as this one, can take time to go to trial. It is not just the prosecution taking the many weeks or months to prepare but also, and especially, the defence. Her attorneys will (should) be painstakingly going through the discovery process and analyzing every bit of evidence the state has against her.
Should, for some reason, her counsel be concerned she is jailed unnecessarily, and without due process, they may file a writ of habeas corpus. A habeas corpus writ requires, essentially, ones jailers to bring them to court for a hearing as to whether their detention is lawful.
Under the Sixth Amendment to the U.S. Constitution, defendants are guaranteed the right to a speedy trial. Pretty much every state has a statute stating when a trial should begin, usually between 60 and 90 days. Many, if not most, denfence attorneys will waive this right in an effort to give them time to mount a better defence.
And finally, if she should be found guilty and sentenced to thirty years, for example, the judge will likely say her time incarcerated prior to trial will count towards her sentence.