I understand Nadiya is from Luton, fair enough, to those (a lot) north of Watford that might seem like an immigrant 
She is a beautiful young woman with a true talent and love for baking, that is what mattered to me. Certainly "posturing" didn't come into it. How rude a comment was that! ( a few days ago, not present company)
I do see a lot of young women opting for the hijab during/ after adolescence and I assume it is their own choice as they are frequently (at least the ones I know) intelligent educated girls/women like one of our GPs, one of the pharmacists locally, a teacher at my last school as well as doctors and nurses.
Surely they are demonstrating that it is possible to combine aspects of their "traditional" culture with life in the 21st century.
My mother's generation wore a hat to church when they were younger, and we were expected to as children, some women still do out of choice, just as a pathetic example of something I have experienced