Hi,
While searching I came across an entry about Felicity Mabel Owen, and her family in 1926, on a ship to Beunos Aires. No mention of her mother.
Passenger list of the ship UPWEY GRANGE arriving to Buenos Aires on Feb 01, 1926.
OWEN, FELICITY MABEL ALEX. Unknown 2 years old
OWEN, HELEN ALEXANDER LIL. LONDRES 7 years old
OWEN, THOMAS ALEXANDER Unknown 5 years old
OWEN, TOMAS ALEXANDER Unknown 43 years old
This might help with finding her family, who seem to have done a lot of travelling. The "Upwey Grange" was torpedoed in 1940.
Printer