Is it permissible for a female employee to take a sick leave salary issued without appearing before a medical committee, and is she entitled to financial differences for a previous period of unpaid leave?

The employment contract specifies whether sick leave is paid or not, as well as the conditions for granting it and the granting authority. If the contract stipulates compensation, then wages may be taken; otherwise, not. The reason for the leave must be illness; otherwise, taking wages would be consuming people's wealth unlawfully, and repentance and the return of the money would be obligatory.