Without further info any findings will be complete guesswork.
If she was having children in 1920, she must have been, say aged 16 - 45 then.
So she was born 1875-1904.
She was in Worcester or Hampshire then - but could have been born anywhere and spent the previous years of her life anywhere.
sorry, but a bit of a non starter!
You say Black is her maiden name - so does that mean you know she married? If so, when and to whom? Her marriage cert might give more to go go (maybe an age, and a fathers name and occupation)