Well, as you might guess, I don't think she is even /remotely/ attractive. That photo is somewhat unpleasant to look at for me; it evokes feelings of distaste bordering on revulsion.
Now, it's well known, I'm out on one end of the curve in terms of female body shape preference, but let me try to be a bit more objective.
To be of "normal", that is to say healthy weight, she should be in the region of 10st to a bit over 11st. That's a body mass index of 20-25; in the white band on this chart.http://www.caloriecounting.co.uk/resources/charts/ideal.htm
According to this story in the Mirror, she's 12st 8lb.http://www.mirror.co.uk/news/topstories/2008/03/03/chloe-marshall-becomes-the-first-size-16-miss-england-entrant-89520-20338697/
That puts her at a BMI *well* into the overweight band. Not obese, but significantly overweight, by about 16%. (I'm not that good with Imperial; that's comparing 10½st (the upper limit of the healthy weight band for her size) to 12½.)
In other words, she is more than 2st overweight, or about one-sixth of her body weight is excess fat.
Yes, her shape may be "normal", but all that means is that it is now normal for British people to be overweight to an unhealthy degree.
I submit that it is doing no-one any favours to try to portray it as normal to be carrying too much fat. It's not about positive self-image; it's about health.
Two concluding thoughts:
 Caloric restriction - being half-starved - makes most animals live longer. The results aren't in yet for humans but it works from nematode worms to mice, so it's probably true. Therefore, if nothing else, being fat makes you live a shorter life. (And I don't buy that it's a happier one. I've been fat; it was horrid.) Now, the world is drastically overpopulated; anything that kills more humans is good. So, go for it, proclaim the beauty of fatties!
 Marginally more seriously, I submit that I am not some sicko who likes underfed woman. I just have a more-than-averagely pronounced sense of what is a healthy weight. Even I find some models too skinny these days; I do not find anorexic women attractive.