Why does the girlfriend freeze in groups?

Name: VeditaDate of Birth: 12th May 1997Place of Birth: DelhiTime of Birth: 7:25 PM

My girlfriend always freezes and gets anxious whenever we are attending group events. She does not talk, fidgets, and does not appear to feel at ease even with friends. I'm worried and feel helpless. I believe that her Moon or Rahu-Ketu placements are the cause of her social anxiety. I also wish that with the help of astrology a person would understand the reason she suffers and would give me questions on how to make her feel confident and calm.