I'm all for disability rights but....

[Roy Bloom]

It was her own fault for booking a standard room instead of a wheelchair accessible one on the ground floor.

As she is in a wheelchair, it is sensible to ask for a ground floor room as you're not allowed to use a lift in the event of a fire anyway.

I'm sure that motorbiking will be along in a minute to advise which Act for you to peruse.
There is no obligation on disabled people to inform the service provider of any disability.
The disabled people, especially those that frequently use hotels, etc, will be very aware of the requirements of the relevant Act.
It's a legal requirement for service providers to make their services accessible to disabled people.
New installations, constructions, etc make an assumption that all service users are disabled, so no special provision is required.
Existing facilities need adaptions to make them accessible for disabled people.
How they do that is up to them.
They failed to do so on the occasion mentioned in the article.
Slam Dunk.