It will be the Local Authority who will be paying for care if you qualify. What ever level of care your Mother needs they will pay for. They will pay for care costs not for the best room with the best view.
If nursing care is also needed then that is paid for by the NHS and I think that is around £109 per week.
Is this current Nitram?
I understood that the CQC no longer gives ratings for homes. The are either fit for purpose or not for for purpose. I thought this came in in 2012 when they stopped the star rating.