I have anorexia.
To be honest, I don't think she's that far off the mark in many cases.
As a society, we are quite turned in towards ourselves and there is a constant desire within many people for a) more acceptance and b) more attention. Whether it's just perception or not, anorexia can appear to provide both these things.
At 15, I didn't think I was fat. But I was very unhappy with my appearance and I was quite isolated socially. I wasn't in the 'cool' group and I felt that my friends were just putting up with me. I was overly dramatic and artsy and thought that expressing internal unhappiness was sophisticated and interesting or some such bullshit.
When I stopped eating I became 'popular' (meaning people were interested in me and wanted to talk to me) I saw myself as exotic and fragile and certainly built my personality around being the 'sick one'. Certainly, I had a mental illness but to say that there was no element of attention seeking and narcissism in would be disingenuous. And although I didn't 'choose' to have anorexia, I also didn't choose to help myself and fix anything either. I think that might be a relatively common teenage experience.
Now that I have been anorexic for more than half my life, it's a bit different. In my professional life I obviously go out of my way to hide it and appear normal. I certainly don't want it to be my identity and don't draw attention to myself in that way. But I still have the tendency to regress that way among long standing friends and family. Sometimes it's like I don't know who I am if I'm not anorexic.
Anorexia is not a romantic, 'pretty' illness. Sufferers are certainly not always sweet, unassuming, perfectionistic teenage girls who want control in their lives or want to fade away and not be noticed. Many sufferers are cross addicted, suffering from other mental illnesses and extremely selfish, irrational and hysterical. They aren't selfish, irrational and hysterical people but the mental effects of starvation produce these behaviours.
Obviously, that's only my experience but I don't think it's that unusual. Anorexia, particularly chronic anorexia, can be very narcissistic indeed.