It seems Emily is still in Newport in 1891 according to the census.
Her birth year there is recorded as 1885 and her mother is recorded as being a widow and Head of the Household.
Marion Street, St Woollos, Newport, Monmouthshire
Elizabeth Mitchell Head Widow Laundress Herefordshire
Emily Mitchell Daughter Newport, Monmouthshire, Wales
Amelia Mitchell Daughter Newport, Monmouthshire, Wales
Charles Coughlin Boarder Watchman Ireland
James Mason Boarder Fitters Labourer Scotland
Clara Blackborough Servant Domestic Servant Bristol
1891 c RG12 Piece 4374 Folio 82 Page 10
MITCHELL, EMILY ELIZABETH
mmn HUGHES 1884 S Quarter in NEWPORT MON Volume 11A Page 199
MITCHELL, AMELIA FLORENCE
mmn HUGHES1886 J Quarter in NEWPORT MON Volume 11A Page 211