Beatrice simply has no energy left for her job. she is totally unmotivated and feels exploited by the company for which she works. she is best described as experiencing

In Psychology it can be described as burnout. It is not plain simple as getting tired but is connected to depression. Burnout may lead a person to stop performing well unlike before. The person who experiences burnout needs time for rest and better yet a change of task where he/she can devote time and develop the love for work without any regret.