>>77357502She didn't embezzle money, but she revealed confidential information related to Cover, to a close friend so Mel and her friend could take advantage of that information for monetary gain, and that could be anything from dates for a collab with another company, dates for auditions, accounting information about Cover, or financial reports about the company.
We will never know the full truth, the only thing for sure is that she broke her NDA with an IRL friend.
The Kotoka rrat is just plain stupid because she knew Kotoka for like 1-2 months before being fired, and all that interaction was supervised by her manager.