Totally agree. I got into cooking through Claudia Roden's book of Jewish food - never occurred to me I should only use Kosher ingredients to make the recipes.
I did learn a lot about Jewish culture, how to keep kosher should I want to (I didn't) and made some great recipes. Big bonus was that due to the demands of the Sabbath they have lots of prepare ahead recipes which were ideal for someone working long shifts.
On my bookshelf I now have books of Moroccan, Turkish, Palestinian, Afghan, Pakistani recipes. At no point did I think I needed to buy halal to make any of them, they are just great recipes.
Somewhere along the line Nadiya hasn't managed to diversify into social media, different TV channels, a restaurant/cafe, a recipe column, other reality TV... Whether this is because she is badly advised, because she just hasn't wanted to, she misunderstood her relationship with the BBC or she experienced racism we don't know.