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. 

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. 

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Mackenzie Shirilla's mother Natalie (shown gasping, right, as she was convicted of murder) told the court that she believes a condition that makes her dizzy could have caused the crash

Mackenzie and boyfriend Dominic Russo. His family and friends testified that she was 'unfair' towards him and regularly threatened him

What was left of the Toyota Camry after Mackenzie plowed into the side of a wall at 100mph. She miraculously survived

Postural orthostatic tachycardia syndrome: POTS

Postural orthostatic tachycardia syndrome (POTS) is one of a group of disorders that have orthostatic intolerance (OI) as their primary symptom. OI is a condition in which an excessively reduced volume of blood returns to the heart after an individual stands up from a lying down position. The primary symptom of OI is lightheadedness or fainting.

In POTS, the lightheadedness or fainting is also accompanied by a rapid increase in heartbeat of more than 30 beats per minute, or a heart rate that exceeds 120 beats per minute, within 10 minutes of rising. The faintness or lightheadedness of POTS is relieved by lying down again.

Anyone at any age can develop POTS, but it mainly affects women between the ages of 15 to 50 years of age. Some women report an increase in episodes of POTS right before their menstrual periods. POTS often begins after a pregnancy, major surgery, trauma, or a viral illness. It may make individuals unable to exercise because the activity brings on fainting spells or dizziness.

SOURCE: NIH  

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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. 

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. 

She refuted claims by Dominic's family that the relationship was turbulent, telling the court instead that the two youngsters were very much in love. 

In the months immediately after the crash, the Shirilla family left emotional tributes to Russo on an online obituary. 

'She loved you, we loved you. My whole family loved you. Forever in our hearts...forever,' they wrote. 

She too left her own tributes.

'I miss you nug. I still feel like your [sic] just going to walk in the door any second. 

'I miss your laugh your perfect smile. 

'I feel your energy around me every day I just wish it was physical.

Russo with Mackenzie and her family. They insisted throughout that the crash was an accident

Shirilla's boyfriend Dominic Russo (left) was killed along with his friend Davion Flanagan (right)

Davion Flanagan was in the backseat of the car. His family said he was simply looking for a ride home, and was an 'innocent passenger' 

After the crash, Mackenzie insisted it was an accident. She left emotional tributes to her boyfriend on an online obituary as did her family

'God u [sic] are the last person to deserve this you had such a perfect life ahead of you. I wish I told you all this more. Please wait for me.' 

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. 

Cuyahoga County Common Pleas Court Judge Nancy Margaret Russo convicted her on Monday, calling her 'literal hell on wheels' who was on a 'mission of death'

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