Why in God's name does she do this?

I joined YouTube recently and am having fun surfing all over the place. But one video popped up and, while well done, I cannot get it through my mind why a genetic girl as pretty as this one would voluntarily cover up like this. Mostly we hear it is 'forced' or a 'religious requirement' but she says it is by her own choice. When I think of how many would love to have and display (show off) a face such as hers it boggles my mind. If you are a member of YouTube just type in the search box: Niqab styles 1 and then please tell me WHY?
Cheers,
Anne