Handled somewhat badly however I cannot, like several previous posters, see how this clearly very 'disabled' person can have expected to have travelled without a) prior notice and b) satisfactory assistance and/or carer along as well - the safety and toilet access issues are clear - if this lady had not notified the carrier and it would appear not made additional support arrangements and the airline was quite correct and within their legal rights/responsibilities to refuse her carriage.
Doubt she'd make any headway in court if she ignored the basic notification requirements but if she is lucky airline will settle with her out of concern for the bad
pr - she deserves no more
Should add that if you look at the story one must assume she had been allowed outbound to travel MAN - LON and was allowed on that sector (by what one assumes was an AF affiliated carrier) but then it says she had gone LON - NY on AF? well I have to read into this either a) she was on Delta? AF codeshare but dont read it quite like that or b) had travelled outbound LON - PAR and onward PAR - NY on AF, if so then this is hardly a sensible and/or responsible travel itinerary for a disabled person to choose (with direct options available) with multiple sector/flight changes now was it!