Hi again
You're right - they're difficult to find!
However on the familysearch site there's a marriage in 1918 St Paul's Hooton (not far from Bromborough Wirral)
This marriage is also on Cheshire BMD -
11th July 1918 Winifred Lowe to Gilbert Lance Dallow
Fathers names William Andrew Dallow and Edwin Jackson
So it looks as if Winifred was either divorced or widowed between 1908(when Christabel was born) and 1918.
Although Winifred does say she was still married in 1911.
Of course it could be possible that Aaron and Albert Aaron might not have been born in this country.
Christabel marries Frank Barker in 1931 in Wirral (Free BMD)
The only death I could see for a Winifred Dallow on Free BMD is in 1951 in Leicester (aged 68)
https://www.familysearch.org/Regards
Neptune