Is the female pharmacist obliged to attend work daily, or can she alternate with her colleagues, given her concern that the salary may be suspicious?

If the manager is not authorized to grant leave for a few days, then it is not permissible. One must adhere to the working hours for all working days according to the regulations and laws, for Allah Almighty says: "O you who have believed, fulfill [all] contracts," and the Prophet, peace and blessings be upon him, said: "Muslims are bound by their conditions."