There is a Catherine Evans born 1846 in Anglesey. Could she be yours?
I think these are her census returns:
1851 - HO107, piece 2521, folio 296, p 33.
Back Street, Amlwch, Anglesey.
Elizabeth Evans, Head, M, 65, Mariner's wife, b. Llanallgo, Angelsey.
Catherine Evans, Visitor, 5, Scholar, b. Amlwch, Anglesey.
1861 - RG9, piece 2886, folio 77, p 5.
115 Medlock Street, Hulme, Lancashire.
John Edwards, Head, M, 43, Grocer & Provision Dealer, b. Anglesea, Wales.
Ellen Edwards, Wife, M, 41, b. Derbyshire.
Henry Edwards, Son, 9, b. Manchester.
Catherine Evans, Servant, 15, b. Anglesea, Wales.
1871 - RG10, piece 3973, folio 96, p 6.
Northenden Road, Limefield, Withington, Lancashire.
Ralph Waller, Head, M, 56, Spinner & Manufacturer, b. Liverpool.
Ursula Waller, Wife, M, 51, b. Blackburn.
Ralph D Waller, Son, S, 24, b. Manchester.
Catherine Evans, Servant, S, 25, Waitress, Domestic, b. Wales.
Mary Robinson, Servant, W, 31, Cook, b. Stockport, Cheshire.
Matilda M Garstang, Visitor, M, 24, b. Over Darwen, Lancs.
Florence Garstang, Visitor, 7mths, b. Blackburn, Lancs.
Good luck with sorting out the connections.
Monica