HRCI Exam SPHR Topic 1 Question 55 Discussion

The company receptionist has always been cheerful and warm when greeting customers and has taken the initiative to do what needed to be done without waiting to be told. She has always kept the front desk tidy and presentable for visitors. Over the last few weeks, the receptionist has become moody and called in sick several times complaining of headaches, and the reception area looks disorganized all the time. This receptionist is showing classic signs of which of the following?