Assistance with cost to help make Mum comfortable?

Me and my sister look after our mum who is 77 with COPD and basically bed-ridden as well as looking after our families and doing part-time jobs. We recently explored any allowances she could get for her carers but frustratingly my mum seems to be too proud or stubborn to admit she needs that much help, so to claim seemed pointless.

To cut a long story short, she now has lost so much weight and is uncomfortable in bed. Seems like bed-sores. A mattress topper would make her more comfortable, so I looked to get her one. The cheapest is 65 pound, so can anybody tell me if any organisation or government agency provides this type of thing?

Thanks