As I and many others on this thread have said, diagnosis is essentially irrelevant to disability. No two people with the same condition have identical levels of disability, even if they have similar symptoms.
The way forward is to find strong evidence to corroborate the claimed level of disability. Doctors may know (but often do not), though they may well be able to state with confidence that something cannot be true in this case if they know the patient well. In a disorder like this, the consultant (?a neurologist, I guess?) may know more than the GP.
Physiotherapists and occupational therapists are likely to know a lot more, as are friends and relatives. And the best possible evidence is from your client, truthfully describing, in person, what her life is like.
Let me put it this way. If you x-ray the spine of every perosn over 50 in this country, every single one of them would show significant degenerative changes, and loss of disk height (what doctors usually and unhelpfully seem to describe as "crumbling"). And the level of disability - if any - found among them would bear no relationship at all to the extent of the changes.
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