A moving account of her early death is recorded in her father's diary as follows:
Friday 3 [Sept 1813]. At Macclesfield with Mr Bent. Brewery &c.
Saturday 4. Returned from Macclesfield. Dined at Mrs Hatrells with Mr Parker Coke & a party. Sneyd Mr & Mrs Tomlinson Mr Bent &c.
Sunday 5. At home. Service. My poor Mary suddenly much worse. . . .
Tuesday 7. At home. Much engaged on papers &c relative to the Navig. businesses & Affairs previous to my meeting Mr Sparrow of Bishton Mr Webb & Mr Simpson at Stone tomorrow. In the evening Mr Patterson Tenant of the Congleton Corn Mill . . . relative to the River Dane water wrongfully taken by the Co. Taking his examination &c. Prevented this day from seeing my beloved Mary.
Wednesday 8. At Stone taking Mr Thos. Sparrow along with me in the Carriage. Met Mr Sparrow who alone attended the Conference. Stated at length to him & as clearly as I was able, the result of my consideration of the various matters that had arisen & the importance of a candid explanation in order to do away all misunderstanding & prevent these mischiefs that could not fail to be brought upon this great concern from want of confidence & harmony amongst those more immediately intended & . . . employed in the management. Heard by Mr S with great candour and patience that finally the satisfaction to . . . [?sever] all his doubts & objections & bring about a perfect explanation & reconciliation between him & Mr Robinson. Took next into consideration the Dane Feeder business on which much & long deliberation. Gave Mr S the sketch I had drawn to assist him in preparing a Clause to be earmarked to the consideration of the mill owners. Returned home, with that highest . . . . . . gratifications, a self approving mind arising from . . . of the good that by temper & consideration I had that day done. But short alas! how short the enjoyment of it on returning the house I found Dr Darwin who had arrived a little time before having been sent for express, in consequence of my dear, my heart dear Mary having become much worse. Found all reasonable ground for hope gone. Saw her soon after. Never will be erased from my brain the impression of the moment when I first beheld her or the . . .[&ldots;dness] the sweetness the affection with which she took and pressed my hand in hers, called me her "dear papa"
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Thursday 9. In the morning Dr Darwin left as all hope being at an end.
Her mother sat up with her all night.
Friday 10. At about seven o'clock this morning she inquired for me. I hastened to her when she again took & pressed my hand in hers retaining it a considerable time & attesting with peculiar affection her usual tender expression of "dear papa". Having asked for & given her a kiss I returned after some time. Her pulse was at this time so strong & quiet as to surprise me much. About noon Mr Bent called soon after Mr Skerrett who staid. On Mr Bents going away I went to her Room with her mother where I remained till all was over. She expired about half past five o'clock; having a late time before called "Mamma". Her mothers hand & mine were locked in one of hers and her passage [sentence left incomplete]
Oh! Death when is thy sting. Oh Grave where is thy Victory?
Saturday 11. In the morning after much & painful effort proposed to my beloved Eliza that [sentence incomplete]
In the evening Mr R Skerrett
Sunday 12. Mr Holland & Mr R Skerrett. Afterwards Mr Halsell.
Monday 13. Mr Wood called. Plate.
Tuesday 14. [no entry]
Wednesday15. Mr Bent
Thursday 16. Found inscription over the Fire. In the evening Mr Skerrett arrived from Teignmouth.
Friday 17. [no entry]
Saturday 18. At about 12 o'clock, left Linley Wood with the remains of my dear Mary.
Bearers Josiah Wedgwood, William Sneyd Ashcombe, Charles Lawton, William Bent, Thomas Sparrow, Sir John Blunt, Enoch Wood, Rev Thomas Batt.
Red. W Hicken (by whom the Funeral Service performed) & Mr A Skerrett.
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Sunday 19. Service. Read the excellent sermon of Dr. Smalridge Bishop of Bristol from Psalms 42. 11 Why are thou cast down &c. illustrating & confirming the important truth of Trust in God being the best support under affliction.
(family diaries) (Linley Wood)