Carter was reportedly released more than three months ahead of schedule for good behavior.
The 23-year-old was denied an appeal on Monday, but that doesn't mean she'll be behind bars for long.
"You know, I don't think about her at all."
Carter is asking to be released early from her 15-month jail sentence.
The documentary will premiere July 9 and 10 on HBO.
Michelle Carter had texted her boyfriend: "You just have to do it," before he killed himself.
If the conviction stands, Michelle Carter will be the first person in the United States to be charged with involuntary manslaughter by means of words alone.
Michelle Carter was sentenced to two-and-a-half years in prison but her case is far from over.
Legal experts have expressed concern about the future implications of Friday's involuntary manslaughter guilty verdict for Michelle Carter.
Michelle Carter was on the phone with her boyfriend Conrad Roy III the night he took his own life.