Michelle Carter is demanding her freedom, saying she shouldn’t have been found guilty of egging on her boyfriend to commit suicide because the worst text was “cherry-picked” to doom her, according to new court documents filed yesterday.

Carter was found guilty of involuntary manslaughter last summer for Conrad Roy III’s July 2014 suicide in Fairhaven for texting and calling him to “get back in” his truck as it filled with deadly carbon monoxide.

She was 17 at the time. Roy was 18.

Now her high-powered legal team is taking on Massachusetts law arguing the case — considered the first of its kind in the age of nonstop teen texting — was based on one long message and ones showing her softer side were ignored.

“I’m not giving up on you,” Carter texted in July 2014, her lawyers state, “it’s just every time I try to help you don’t listen.”

And “You aren’t gonna get better on your own … you need professional help …,” she adds in her filing with the Supreme Judicial Court.

As she sought help for an eating disorder, her lawyers argue she again urged Roy to do the same, telling him “… we can go together so we will be there for each other.”

As for the pivotal “get back in” the truck comment, her lawyers state that “confession” was “sent two months after the fact” to a friend and was “cherry-picked” for the grand jury to hear.

“It was Roy, not Carter, who researched the idea, developed the details, obtained the necessary equipment, picked the spot (near a Walmart) to park his truck, and put his fatal plan in motion,” the appeal states.

Plus, “words alone” cannot be used when a defendant is “absent,” her lawyers add.

And, according to the 66-page filing with the SJC, Carter specifically targets the lack of an assisted suicide law in the Bay State.

“Given difficulties with applying the common law of murder and manslaughter to an area as fraught as assisted suicide,” her legal team states, “most states adopted the ‘modern statutory scheme’ that ‘treats assisted suicide as a separate crime, with penalties less onerous that those for murder.’ ”

But, as attorney Daniel Marx writes as the lead author of the landmark appeal, “Massachusetts has fallen behind the national trend and failed to address” assisted suicide with no law on the books.

Carter was sentenced to 15 months in jail, followed by five years’ probation. That jail time has been postponed as she appeals.

The SJC has agreed to consider the controversial case — a decision that will require the court to delve into the murky intersection of modern technology, free speech and homicide.

Should the SJC rule against her, Carter’s attorneys have indicated they would consider taking the case to federal court.

Carter’s defense team now includes former federal judge Nancy Gertner; William Fick, who represented convicted marathon bomber Dzhokhar Tsarnaev in his trial; and Marx, a respected defense attorney who is involved in litigation stemming from the ongoing Bay State drug lab scandals.