Pearson was told she may face prison after being convicted
Shanique Syrena Pearson shouted abuse, threatened to knock him out and made a gun sign at the TV star during the row.
She was told she may face prison after being convicted at Hammersmith Magistrates' Court on Wednesday of road rage offences.
The 22-year-old single mother left court with a jacket over her head and told the press outside: "I'm not happy."
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His manner of cycling was perfectly appropriate for the conditions
District Judge Timothy King
District Judge Timothy King said he found Vine, who did not attend the hearing, to be a "credible, truthful and reliable" witness who had not exaggerated his account of what happened.
"His manner of cycling was perfectly appropriate for the conditions," he added.
He said it was reasonable that the presenter feared for his safety after Pearson threatened him and formed a weapon with her fingers cocked at his head.
Pearson, who has a number of previous convictions including assaults and theft, rolled her eyes and shook her head as the decision was announced.
Pearson was screaming at BBC presenter Jeremy Vine
Her latest offences were committed while she was subject to a suspended sentence and her case has been sent to the crown court.
Judge King said: "The court will decide whether the suspended sentence imposed should be activated in whole or in part."
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Pearson's defence lawyer, James O'Keeffe, said she has been vilified on social media after Vine posted the video online.
"He wanted that person to be punished, not just in court but on the internet and in the media, and she has been," he added.
Pearson has a number of previous convictions
"She has been racially abused and suffered substantially because of that judgment by Mr Vine, someone prominent in the media, and he has had his 50 million hits."
He previously said Vine had "racially stereotyped her as a black person".
The spat was captured by the 51-year-old Crimewatch presenter on his helmet camera during the ride from his home in Chiswick, west London, to BBC offices near Oxford Circus.
He was cycling in the middle of Hornton Street in Kensington, west London, which had parked cars on either side, on August 26 last year, but stopped after being hooted at by the driver of a black Vauxhall Corsa behind him.
The incident was filmed
In the video clip, Pearson can be heard screaming expletives at Vine, who tries to explain why he was riding down the centre of the narrow street, before she kicks and pushes the cyclist and his bike.
She denied making a threat, and claimed to have put her middle finger up at the presenter, who she thought was "a bit crazy" for following her after their initial row.
Pearson, of Vauxhall, south-west London, has been convicted of driving an unlicensed vehicle, driving without reasonable consideration for other road users and using threatening, abusive or insulting words or behaviour.
She was released on bail and will be sentenced at Isleworth Crown Court at a date yet to be set.
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