In 1881, Eleanor was living at 41 Nelson Street, Mile End Old Town, London with her parents and sister:
Alfred Edwd. Snelling Head Mar 34 Plumber Decorator Mile End Old To
Eliza Rachel Snelling Wife Mar 27 Mile End Old Town
Eleanor Sarah Snelling Daur 5 Mile End Old Town
Edith Eliza Snelling Daur 1 Mile End Old Town

Her mother's maiden name was Eliza Rachel SCARLET, and her parents married in q3/1874 in the District of St George in the East, London, Middlesex, England.
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We see Eleanor again in 1891, living with her parents at 41 Nelson Street, Mile End Old town, London:
Alf'd E Snelling Head M 44 Painter & Decorator London Stepney
Eliza R Snelling Wife M 36 (Unidentified Occupation) London Stepney
Eleanor S Snelling Daur S 16 (same Occupation as her Mother) London Stepney
Edith E Snelling Daur S 11 Scholar London Stepney
Laura A Snelling Daur S 6 Scholar London Stepney
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This is Eleanor's parents and siblings in 1901 living at 91 Jamacies Street, Mile End Old Town, London:
Alfred Edward Snelling Head M 54 Painter Stepney
Eliza R Snelling Wife M 46 Soap Packer Stepney
Laura A Snelling Daur S 16 Soap Packer Stepney
George E Snelling Son S 6 Stepney
Henry Clerk Boarder S 23 Builders Labourer Devonshire
James H Monday Boarder S 50 Ironmongers Assistant Somerset

I believe that George E Snelling was in fact, Eleanor's son.
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Eleanor married James Knibbs in 1906.
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Eleanor died aged just 39 years.

See George's Baptism Registration
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George was living with his maternal grandparents in 1901.
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George married Priscilla Matilda Cooper of 3 September, 1916 at St John's Church, Bethnal Green, London. His occupation at the time was "Soldier" and the box for his father's name in the register was left blank.

I believe they had a son also named George, born during q4/1920 in the Bethnal Green District of London.