Catherine died 5.11.1877 according to post - that burial was October 1877. However - see freebmd entry
December qtr 1877
Catherine McClen aged 47 Durham 10a 201
No other entry in the Dec qtr 1877 so death date of 5.11.1877 cannot be correct
she died on the 5th of november 1877 gilesgate moor
point taken, it does seem to be a tad previous for a burial :-)
As you say there is only one Catherine Mclen/Mclean in the GRO deaths index for anywhere in Durham 1877 and that has an age at death of 47 . This was the only burial I could find that was a possible - though its a transcription only and I haven't seen the original.
The 1871 census quoted, when I look at the images, says Ecclesiastical District of St Giles, Belmont and the age on the burial transcript/ GRO index, though not totally consistent to that on the census, is within a couple of years. The 1881 census for her husband and children has an address of Bell's Villa - which is another reason to put this burial into the 'possible' category.
If squatt has a death cert with 5th Nov on as the d.o.d. then its not the right burial / or the burial date may have been mistranscribed. I do think its a possible and would want to see IF the original register gives any more detail.
If there is an LDS family history centre near to where squatt lives, the digital image can be seen on their computers there.
https://familysearch.org/search/catalog/705236?availability=Family%20History%20LibraryBoo