What causes a person to develop agoraphobia and panic attacks?

I am not referring to the trigger of the attacks but rather things in a persons past experience that would cause someone to develop the condition later in life.
I ask because my friend who I have known since childhood has developed both conditions. She had a very privileged up bringing as her parents were wealthy, I do not think she was bullied at school (I was in schools with her) and her family were kind to her. Her father was an alcoholic however, but I don’t know how that would have impacted her. She does not talk about her feelings. She has suffered from low self esteem and had bulimia when she was a teenager, however I do not think she has ever really recovered fully. What can I do to help?

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