Has your Mum had a CHC Checklist completed? and is this the CHC full assessment?
if so just google the NHS CHC DST (which is the decision support tool, the thing that they use to look at all sorts of different areas to help them decide if a person qualifies for the funding) You could always read the NHS continuing healthcare and funded nursing care framework but its a huge document! I have found it very useful as it guided me though the process for getting CHC funding for my Dad. There is also a section on how to appeal.
you could also look on www.farleydwek.com who produce several free booklets about the CHC process and advice on funding and the care system
also the care to be different web site