Stress due to various reasons, lack of motivation in activities and also some form of guilt of not being productive, some form of nightmares and changes in her original nature or personality...is all there in cluster. This cluster of symptoms might be a part of some form of depression but needs a further evaluation. She also needs to be opened up about her thoughts , emotions and any past significant events which yet might not be disclosed by her possibly.
Next Steps
Don't worry, things seem to be at milder levels only. Consult a psychiatrist to rule out clinical depression