It's not desirable for a female to have high, prominent cheekbones - especially when coupled with a high, strong and bony nose. It means a controlling and domineering personality, one that will 'control' the husband too much.
If you look carefully at Rosmah's cheekbones, you would notice that they are quite high, with a bonynose in the middle. What's more, you can see how over the top she is compared to other PM wives. And lastly, you can say Najib is kia-bor...!