There are two Rebecca Mather deaths of matching age.
Deaths Mar 1919 (>99%) Mather Rebecca 71 Warrington 8c 269 Probably the wife of Samuel Mather from Runcorn in 1881 & 1911
Deaths Jun 1923 (>99%) MATHER Rebecca 76 Gateshead 10a 940 This is the wife of John Mather, both born Northumberland
She may have married (aged 17 to 35): 1867, Coventry, NOT John Smith (as she was 27, dau of Henry Mather) 1872, Stourbridge NOT aged 45, dau of William Rawley 1874, Liverpool, NOT to George Hague, dau of John Mather 1874, Basford, Not William Greasly, dau of John Mather
General Notes
There is only one Rebecca Mather born 1846±2. There is no matching Rebecca Mather on any census records.
1 March 1846, Rebecca Mather, daughter of Lomas Mather and Sarah Mather, a spinner, formerly Henshaw was born at Rollinsons Street, Manchester (see image/record).
In 1861, "Rebecca Ann Mather", 11, born Manchester, was living with her uncle and aunt Richard (b.Hindley, 1827) and Jane Mather, a Boot Maker from Hindley, Wigan. This isnt her (instead Rebecca Ann Ingram, born 1849)
Rebecca may be Rebecca Lomas living at the Manchester Barracks in 1864 when she married Sgt Major Charles Miles, in which case Lomas Mather is Alfred Lomas, a tailor.
In 1880, Rebecca Mather (35) arrived at Kansas, USA. This is probably another, MMN = Peabody, who died at Rhode Island in 1923.