Anger and aggression are emotions. Instead of suppressing or showing or worrying about these emotions, person should learn to accept the irritating elements and adjust with it. Adjustment therapy will help you.  Take care

I think she is unhappy either about herself about the environment she is living in to. The behaviour has been developed out of some circumstances over a period. Please consult a psychologist and help.her to share her emotions and find out what's happening.

Loss of interest, decreased concentration and attention, feeling low and disturbed sleep or appetite are some of the signs of depression. Consult a psychiatrist who will assess you in detail. If you are feeling suicidal or hopeless, seek professional help immediately. Try some relaxation techniques like yoga, meditation and deep breathing. Indulge in hobbies. Spend time with people close to you.

This can be sign of agitated depression, consult a psychiatrist