Lady Wilton, nee Lady Mary Stanley, was the wife of the Second Earl of Wilton.
She was in the Duke of Wellington's carriage when William Huskisson had his accident. Afterwards, she gave Frances Anne Kemble a narrative of what happened.
"The engine had stopped to take a supply of water, and several of the gentlemen in the directors' carriage had jumped out to look about them. Lord Wilton, Count Batthyany, Count Matuscenitz and Mr. Huskisson among the rest were standing talking in the middle of the road, when and engine on the other line, which was parading up and down merely to show its speed, was seen coming down upon them like lightening. The most active of those in peril sprang « Back into their seats; Lord Wilton saved his life only by rushing behind the Duke's carriage, and Count Matuscenitz had but just leaped into it, with the engine all but touching his heels as he did so; while poor Mr. Huskisson, less active from the effects of age and ill-health, bewildered, too, by the frantic cries of, 'Stop the engine! Clear the track!' that resounded on all sides, completely lost his head, looked helplessly to the right and left, and was instantaneously prostrated by the fatal machine, which dashed down like a thunderbolt upon him, and passed over his leg, smashing and mangling it in the most horrible way."