Betty Labey Jeffries (196) was born on 2nd May 1903 at Crouch End, Edmonton, London.
In 1911 she was living at 51 Leith Mansions, Grantully Road, Elgin Avenue in Westminster, London.
I can find no evidence of her marrying or having children.
What I can find is her amount of travelling across the Atlantic. This has been previously referred to in relation to her father, who died in New York, but her travelling notes make interesting reading:
In 1920 she is found living in Scarsdale, Westchester, New York with her father
An extract from the New York Census of 1920
Aged 18 1921 living C/o Bradford and Nerrols, Taunton travelling with her father, Edward Jeffries, a 51 years old decorator. She was listed as a student.
Aged 21 1924 living at Nerrols, Taunton, Somerset and travelling with Jane Perchard Jeffries
Aged 23 1925 travelling alone and shown as a student living at 9 Upper Park Fields, Putney, London
Aged 25 in 1928 she sailed into Quebec, Canada having boarded at Greenock. She gives her country of residence as the USA.
Aged 26 1929 living at Nerrols, Taunton and travelling with Edward Coles Jeffries, a decorator, aged 59, living at 9 Upper Park Field, Putney, London
Aged 28 1931 living at Belvedere House, Nerrols, Taunton travelling with Mother - Jane Perchard Jeffries of Le Parcq, Faubic, Jersey
Aged 31 1934 travelling with her mother, Jane Jeffries, a 67 years old housewife. Betty’s address is given as Le Parcq, Faurie, Jersey and she is listed as a secretary
Aged 46 1949 living at Hay, Dinwoody, 13 Springfield Crescent, Parkeston, Dorset with occupation of Secretary and travelling with her 82 years old mother, Jane Perchard Jeffries.
She died in Bournemouth, Dorset in 1980.
She never married.