The Massachusetts woman who taunted her teenage boyfriend via text into killing himself will spend 15 months in prison, the state’s top court ruled Wednesday in batting down her appeal.

Michelle Carter, 22, was convicted of involuntary manslaughter last year for pressuring her beau Conrad Roy III into inhaling car fumes until he died. She appealed the conviction, but the Massachusetts Supreme Court shot her down.

“The evidence against the defendant proved that, by her wanton or reckless conduct, she caused the victim’s death by suicide,” Justice Scott Kafker wrote in the state high court ruling.

Carter badgered Roy with texts to “get back in” his running Ford F-250 as it filled with carbon monoxide in a Kmart parking lot in Fairhaven in July 2014.

“And then after she convinced him to get back into the carbon monoxide filled truck, she did absolutely nothing to help him: she did not call for help or tell him to get out of the truck as she listened to him choke and die,” Kafker wrote.

Her lawyers argued she could not be responsible because she wasn’t there.

Carter has remained free while she appealed the 2017 decision.