See, this is what makes me strongly suspect that she's one of the two Winifred Joneses born in 1889 in Wiltshire...and I'm tending towards the one born in Southwick (Melksham area) who is then listed as an inmate in the Union Workhouse at Semington in 1911 age 22...all the dates, and the areas, fit, and as I say the story told in the family is that Winifred "went up North" to give birth to my grandad...
Of course if anyone is able to check the 1901 census for Winifred (M) Jones (with news on parents Frank and Jane), when she's 12, that would be great...now I think back I also have a vague recollection of her middle name being May or Mary or something like that, but it's so long ago...