The woman was 27 when she on two occasions in August of last year had intercourse with the boy in a small village in Jämtland in western Sweden.
The district court in Östersund said in its ruling that the woman had a family relation with the boy and that she knew he hadn't yet turned 15, which is the age of consent in Sweden.
The woman was convicted for sexually exploiting a child. According to the court's ruling, the offence was less serious because the woman seduced the boy two weeks before his fifteenth birthday.
The woman must also pay 30,000 kronor ($3,600) in damages for the indignity to which she subjected the boy.