Polygyny or the practice of having more than one wife is legal in India only for Muslims, but National Family Health Survey (NFHS) data shows it is almost as prevalent in other communities, though on the decline in all.
Kipling was paying tribute to the Vicereine who established the Fund associated with her name. This was an organisation which employed medical women (or 'lady doctors') to run a chain of hospitals and dispensaries all over India and Burma.