Sorry for going off topic too SoleSource 
I think that she was a very good actress and she may have said that she was doing this or that, she was so proud, that in the end it isolated her.
I agree about the shopping buddies, perhaps people always ended up asking too many questions and wanted to know more about her? I suppose it's a natural instinct.
When the black boyfriend (sorry, can't remember his name) said that she had no interests, I thought that was a bit unfair and a dismissive viewpoint - it sort of debased her identity to little more than appearance and a voice, which cannot have been true when she had so much vivacity. She had sung in a studio and put her voice to a record (how many people can say they have done that?) surely she was interested in music? As Sole has said, she was probably interested in fashion, plus she would have naturally have acquired knowledge though her job (was she working in a Treasury department or was this just something she told people?) She would have certainly have had a good geographical knowledge of London after living all over the capital, she would have had opinions on the good and bad places visit, the bars and the restaurants, and it was known that she liked to go clubbing and performing.
It is quite difficult to have no interests in any way, perhaps what they meant is that she didn?t feel proud to say what they were and to explore them and deepen them or that she just wanted to forget herself and make whoever was in her life her main focus to make them happy. Many women tend to do this in relationships but not everyone descends to a lonely death. I wish one of her sisters would explain more.