I don't think her brand has a proper identity and that's why it is failing. It's not high-high end; she's not making couture clothes and she's not on a par with the classics like Dior, Chanel, Balenciaga. But her brand is also not high street per se; most people on average incomes couldn't afford a pair of socks from her brand never mind a dress or bag. I personally think her arrogance has made her create a brand which is trying desperately to be high end, and cost wise it's getting there, quality wise and image wise, it isn't. She would have been better off marketing herself on a par with brands like Jigsaw, Hobbs, Reiss - expensive high street, luxury but not inaccessible. As it is her range is stuck in a warp - neither high end or aspirational but also not affordable high street either. I think she'd be onto a winner if she did a collab with a store like Warehouse or Oasis and get more sales and exposure. She won't of course as she think she's Karl Lagerfeld.
& she can look stylish, but trousers that are a tripping hazard are not a good look.