Answer:
It seems likely that Phoenix is suffering from: major depressive disorder.
Step-by-step explanation:
Major depressive disorder is the one commonly referred to as depression by society in general. It is a persistent disorder, present at most times in a person's life - unlike other disorders that may have similar symptoms, but do not last long. Major depressive disorder is usually noticed by others when the person suffering from it presents low energy, low self-esteem, and lack of interest in activities. As we can see, that seems to be the case with Phoenix, and her symptoms have been evident for quite a long time now - four weeks. It is safe to say Phoenix is suffering from major depressive disorder.