Carter was convicted in June by a judge who said her final instruction to Conrad Roy III caused his death.
Roy, 18, was found near a compression pump that had filled the vehicle with carbon monoxide, in a Kmart parking lot in Fairhaven, Massachusetts.
Regarding the sentencing, Medwed said his impression was that the judge was trying to make sure that Carter, then 17, served time near her home by assigning her to a county and not state facility. The sentence was later stayed, pending appeal of conviction, adds the report.
The judge called the case, which has garnered global attention, "a tragedy for two families".
Lawyer Joseph Cataldo said that "Carter was struggling with mental health issues of her own - bulimia, anorexia and depression - during the time she urged Roy to kill himself", the wire service writes. The judge said although Carter knew Roy was in trouble, she took no action.
"She has not accepted responsibility", she said.
Prosecutors allege Carter, now 20, pushed Roy to commit suicide because she was desperate for attention and sympathy from classmates, and wanted to play the role of a grieving girlfriend.
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In an extraordinary case seen as breaking new ground in a state with no law against encouraging suicide, Carter swapped hundreds of text messages with Roy, repeatedly urging him to follow through on his plan to kill himself and hide it from his parents. In announcing the verdict, the judge said Carter instructed Roy "to get back into the truck well knowing of all of the feelings he exchanged with her, his ambiguities, his fears, his concerns".
"I am fearful that time spent in a confined, prison environment would dramatically impair and impede Michelle's development growth and request that you invoke leniency in your decision-making process", she wrote in a letter, provided to the Herald.
She had faced up to 20 years in prison at her sentencing in a juvenile court in Taunton, south of Boston. You said you were gonna do it. She also mentioned that there should be amendments in the law to safeguard against those families abiding the same pain.
Forget yesterday's news. Get what you need today in this early-morning email. "It exceeds the limits of our criminal laws and violates free speech protections guaranteed by the MA and U.S. Constitutions".
In that ruling, the court found that Carter's "virtual presence" at the time of the suicide and the "constant pressure" she had placed on Roy, who was in a delicate mental state, were enough proof for an involuntary manslaughter charge.
Carter's attorney said that would be addressed in the appeal as well. "I just try to watch over him like I know he'd want me to". "I think MA needs a specific statute that criminalizes encouraging or coercing suicide", he added.