Not the response this woman was expecting from an 'Agony Aunt'

Letter writer 'Sad Sister' writes to the columnist 'Ask Amy' for advice on how to deal with her sister, whom she insists 'doesn't fit in with her family anymore'.
You might be thinking fine, not everybody in every family gets on for some reason or other, but when you see the excuse that 'Sad Sister' gives you will begin to wonder where the problem in the family really lies.