Oh dear, and only been married a year, that is tragic.
It looks like Martha Aldis was the wife of Alexander Aldis, her maiden name being Warburton. They married in 1910. In 1901 she is with her married sister Mary Ann. In 1891 with the same sister before she married, but also with them is a younger sister Charlotte. Charlotte is 18 in 1891, so I'm wondering if that fits with the Charlotte who visited from South Africa.