Eric's quite well travelled in the early 1950s - New York, Madeira, Durban twice, Singapore. No sign of Alice/Dolores with him, but on one trip there's a John Alexander aged 82 of High street, Cardiff also on board. Any relation?
As for her trip to Brazil - she's described as a scholar, which most 17 year old female travellers wouldn't have been, so maybe she was on an educational trip to learn a language