Elaine feels that her life is empty, has lost all interest in her career and hobbies, and wonders if she would be better off dead. she is most likely suffering from

A mood disorder

Explanation:

This can be classified as depression, but it is specific to her mood.

Suicidal thoughts are definitely not healthy, but all of these is because she is not in a good mood.

Some bad moods can last for extended periods of time, and not change. This can lead to a loss of interest in everyday life, suicidal thoughts and a feeling like your life has lost meaning.

This can be treated with medical assistance and therapy.

c would be the answer