I would suggest it should be looked at like this:
If the owner/daughter was the sole occupier, the dwelling would be exempt, as it would be solely occupied by someone who is severely mentally impaired. However, as there is a second occupier it cannot be exempt.
The owner/daughter is liable under the hierarchy rules. She cannot be jointly & severally liable with her mother, as her mother is below her in the hierarchy. Therefore, the rules covering severe mental impairment and joint liability cannot apply.
The owner/daughter attracts a 25% status discount, as she is severely mentally impaired.
If the owner/daughter gets the Highest Rate Care Component of DLA, then the mother could be regarded as a carer, and she would therefore also attract a 25% status discount.
This would leave a 50% liability, which would fall on the owner/daughter. She could, of course, claim Council Tax Benefit, and there would be no non-dependent deduction (as she is getting DLA).
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