The tweet says that it was a "serious, violent crime", and that they got out early on parole, so the 13 years wasn't even the full sentence. With that amount of jail time, it looks like she murdered someone.
13 years served is pretty short for murder in most states. It's more likely aggravated assault, robbery, or less likely something like negligent homicide (e.g., killing someone in a car wreck while intoxicated). Assaults and robberies are far more common.
https://en.wikipedia.org/wiki/List_of_punishments_for_murder...