I've not got a good match for Winifred in the 1891 but this looks like it might be sister Ann Jane in the 1881:
15 Oak Street, Llangollen
RG11/5541/20/34
Household of Morris Roberts, joiner.
Ann Jane Jones, servant, single, 14, domestic servant, b. Llangollen
gnu
Thanks Emyr - I knew about the names - had friends and relatives who used both - and have borne that in mind in my searches. A good shout for non-Welsh searchers though.