Hello Friend, Good that you are seeking a help here. Behaviors with anger, irritation, frustration, Mood swing, short tempered etc are expression or outburst of stress in mind. Sometimes body condition like excess heat in body, PMS, acidity, foods habbit, lifestyle etc can also influence stress. She needs to start a stress management plan immediately in consult with a Psychologist expert. She can adopt few lifestyle changes, follow certain daily routines, excersise, self therapies, yoga along with counseling support as stress management. Ask your friend to reach out to me online for further evaluation