I've noticed that she Is very quick to ignore the facts (such as the doors being too narrow for her large scooter, and the trains are upto 20 years old!) The only problem is that there are a lot of people who will only blame the TOCs for all of the rail stock issues (I don't work for the railway industry but I've seen it first hand, where Conductors and station staff have been abused say because of a previous late train and the one they are on was being held at a red signal)
As for the situation with the scooter, I've been in the position where I've been accused of discrimination simply because one lady with a fairly large scooter (well it was more like a small car!) tried to go shoping in the store that I worked. I politely explained to her that because of health and safety issues (the size of her scooter, the turning cycle and the width of the aisles) but that wasn't good enough and despite myself being polite, I was spat at, sworn at and even a couple of other customers defended her!
Just to note though I do feel for those that struggle with disabilities and have even carried luggage for people across bridges and on to trains, but some people are just expecting everything to change just because of them and if you don't jump over hoops for them, you'll get abused unfortunately

(just to note though, I know that this is only a small majority and most are fairly kind people. I just hate seeing people just doing their day job well just to get abused and sworn at because of things beyond their own control (I have been a manager before now, so I've probably seen most types of abuse

)
I apologise if any of the above is offensive in anyway, it was not intended to be. I know that most people with scooters aren't like the above example and in no way wish harm or intend to insult anyone with real mobility problems (I have a couple of friends who have scooters for legitmate reasons, multiple sclerosis and they can't walk that far without them)