In a post on X, she used the phrase "damn brat" about the then 12-year-old boy.
Murhaf Hamid in Skåne's Glimåkra sold flowers for over five million kronor last May and later received the award "engagement of the year" from Queen Silvia.
His guardians have told that he became sad when other children sent the post to him, and for a while, he stopped going to school because he thought everyone hated him.
The woman is sentenced to probation and must also pay 30,000 kronor in damages to the boy.
She has denied that it was she who wrote the comment on X, which was then called Twitter, and claimed that her account had been hacked. The court finds the explanation far-fetched and points, among other things, to the fact that the comment was in line with other posts she had made on Twitter and Facebook.