Final answer:
Danielle is most likely in the state of exhaustion in Hans Selye's general adaptation syndrome.
Step-by-step explanation:
The state of Hans Selye's general adaptation syndrome that Danielle is most likely experiencing is exhaustion.
The general adaptation syndrome, proposed by Hans Selye, consists of three stages: alarm reaction, stage of resistance, and stage of exhaustion. When stressors tax the body for a prolonged period of time, the body enters the stage of exhaustion. Symptoms of this stage may include depression, suppressed immune response, severe fatigue, and even fatal heart attack. Danielle's symptoms of frequent cold and flu and depression align with the stage of exhaustion in the general adaptation syndrome.