Mackenzie Shirilla’s mother tried to blame her fatal, intentional car crash on a condition that makes her dizzy despite the fact police found marijuana in her system and magic mushrooms at the scene, then held her head in her hands in disbelief as a judge found her guilty.

Conviction

Shirilla, now 19, was this week convicted of the murders of her boyfriend Dominic Russo, 20, and his 19-year-old friend Davion Flanagan.

In July last year, a then 17-year-old Shirilla drove her Toyota Camry into the side of a building in Strongsville, Ohio, at 100mph.

All three had been smoking marijuana and cops also recovered magic mushrooms from the scene.

They say a black box from the car shows Mackenzie put her foot to the floor on the acceleration and made no attempt to brake.

Prosecutors argued, and a judge agreed, that it was a deliberate act of murder by Shirilla, who was in a turbulent relationship and who’d been overheard threatening her boyfriend in the past.

She and her family insisted it was an accident and that she lost control of the car. Since Monday’s verdict, Shirilla’s attorney James McDonnell has repeatedly declined to comment.

Her mother, Nathalie, said she ‘completely disagrees’ with the judge, and hopes McDonnell will file an appeal on behalf of her daughter.

During the trial, Nathalie testified that Mackenzie suffers from postural orthostatic tachycardia syndrome, a condition that causes dizziness.

The condition, commonly abbreviated POTS, is one of a group of conditions that reduces the volume of blood that reaches the heart after an individual stands up.

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The most common symptom is light-headedness or dizziness. When asked if that could have caused the crash, her mother said: ‘It could be.’

Mackenzie’s aunt also testified in her defense.

It was another four months before Mackenzie was arrested and charged with murder, felonious assault and aggravated vehicular homicide.

She was held in jail on a $500,000 bond until her bench trial, during which time the court heard previous recordings of her threatening to key Dominic’s car.

The pair had become particularly acrimonious in the weeks leading up to the crash.

As for Flanagan, Dominic’s friend who was also killed, prosecutors said he was in the wrong place at the wrong time.

Police said there was extensive evidence of reckless driving on Mackenzie’s social media pages, where she posed with cigarettes or alcohol behind the wheel.

The teenager will return to court to be formally sentenced on August 21.

The charges carry an automatic sentence of life in prison with the earliest chance of parole at 15 years.