Nicholas Flanagan, prosecuting, said self-employed Mr Burton had briefly been introduced to Wall during a January 2019 event he hosted, with about 200 attendees, at Villa Park stadium in Birmingham.
Wall asked him to pose for a photograph with her and their exchange lasted less than two minutes.
The court heard that months later, and throughout 2020, Mr Burton was told by colleagues that posts intending to damage his reputation were coming from social media accounts in the name of a Sam Wall.
Mr Burton blocked her from all his social media sites, the prosecutor said, but Wall was undeterred and began to falsely claim that he and others were abusing her.
He then turned to two legal companies who wrote to Wall to advise her to stop posting about Mr Burton.
She responded by posting one of the letters on social media.
Mr Flanagan said: “The attacks then intensified.
“The defendant claimed that Mr Burton had poisoned her cat, had continually called her, and made claims that he was having affairs. This was particularly distressing, as Mr Burton is happily married.”
In June 2022, Wall posted on Twitter that Mr Burton had tried to kill her, the court heard, and went on to falsely claim that he was being investigated by the police for stalking and harassing her.