Speaking outside court, Crown Prosecution Service lawyer Greg McGill said, "DCI Casburn has been found guilty of misconduct in public office - not only did she seek to divulge confidential information, she sought to leak details of a case to the very newspaper under investigation".
"This is a very serious offence and the jury has today agreed that DCI Casburn's actions were criminal", he added.
More top news
The former Manchester City forward has denied the allegation of gang rape and is expected to appeal.
The 14-year-old is one of the country's most talented trampolinists, but her skills extend far beyond just sport.
A man who spent nearly 46 years in prison for a crime he did not commit has told ITV News he is not "bitter" about what happened to him.