Yakovleva worked in the organization as a cleaner

Yakovleva worked in the organization as a cleaner, getting paid at least once a month. She did the work at set hours: she cleaned part of the premises at the direction of the commandant before the start, and the rest at the end of the organization’s working day. Two years later, Yakovleva applied for annual leave. The director of the organization refused to give Yakovleva leave, referring to the fact that she works under a contract; an employment contract was not concluded with her and an order for employment was not issued, therefore, she does not have the right to leave.
What legal relationship is Yakovlev with the organization? Give a legal assessment of the director’s actions.