Hello Friend, Good that you are seeking a help here. Anger, frustration, irritation, Mood swing etc are expression of stress. Delay in Marriage could be one of the reason. Sometimes body condition like excess heat in body, menstrual issues, hormonal change, acidity etc can also trigger such behavior. She may need a proper assessment to first figure out the reason and the a suitable situation to handle both emotions and physical health if required. Counseling can help in such suitations. Feel free to reach out to me online through Practo for further detailed evaluation and suitable recommendation.

Hi, its just a phase, she needs to overcome the stress by learning to manage her frustration. consult with me or any psychologist for therapy and counseling. all the best

Delay in marriage is a big thing in Indian culture. People around( family members, neighbors etc) keep reminding you of that. These things can trigger irritability. At times irritability is a presentation of depression. Things will clarify if she is taken to a professional for assessment .