I think it's partly because she's just so unlikeable - especially if you've seen her on Made in Chelsea - and partly because her content is an absolute snoozefest. She didn't even bother putting music in her latest vid.Not enough followers methinks. For her level of 'fame' she should have at minimum 30k subs by now. The real question is why isn't her channel blowing up compared to some of her peers? I commend her for letting her channel grow organically though.
Also, what is it with the open-mouthed posing - is she trying to catch flies?