Hi Lesley,
I did some searching for your Drummonds today.
I think that your original source might be wrong about Katherine's immigration. You said she arrived in Australia in 1890 on the "Duke of Norfolk". I couldn't find a C/Katherine Drummond arriving that year. I checked the Ship's Arrival's Book and the Duke of Norfolk did not travel to Australia that year - it did 2 trips in 1899, 2 trips in 1900, 3 trips in 1901 and 2 in 1902. However I did find a couple of possible alternatives for your Catherine.
As you know, there are many Drummond immigrations on the online index, and that is before checking for more in the card indexes.
I couldn't find Peggy Woods on "the "Duke of Buccleuch".
"Duke of Buccleuch" sailed from London on 5th Oct 1887 and arrived Brisbane 6th Dec 1887, Capt Langlois.
Free passengers disembarking Townsville:
Drummond Elizabeth, female, occupation or calling: DS (domestic servant), religion: protestant, county or country: Northumberland, remarks section is blank.
[just as an interesting aside, 2 infants died on the voyage and there were 5 male stowaways

]
So you see, very little information ....
"Jumna" sailed from London 25th Aug 1888 arrived Brisbane 13 Oct 1888. Capt Burkitt.
Free passengers Townsville:
Drummond Emma, 25, female, DS, RCath, from Midd (Middlesex I imagine). On the same voyage was Emily Drummond age 16 - all other details the same as Emma's.
"Taroba" sailed from London 20 Nov 1888 arrived Peel Island quarantine 7 Jan 1889 landed Brisbane 11 Jan and Immigrants on 15 Jan 1889.
Free Townsville:
Drummond Kate, 18, DS, RC, Northumberland
Drummond Catherine (exactly the same details as above - I wonder if she was counted twice or perhaps there are two and they're cousins?)
arrived Townsville quarantine 2 Jan 1889, released 14 Jan 1889. I thought this sounded as though there was illness on board but there were no more deaths than usual).
Does this sound as though it might be your Catherine?
Is this one of yours?:
"Jumna" sailed from London 25th July 1890 arrived Brisbane 13 Sept 1890. Capt Smith.
Free Townsville:
Drummond Ellen, 28, DS, protestant, Northumberland
"India" sailed from London 14th Dec 1891 arrived Brisbane 5th Feb 1892. Capt Johnston.
Mackay Free:
Drummond Margaret, age 16, DS, she could read and write, RC, from Durham
Let me know what you think so far Lesley. I hope this all makes sense and that they're the correct girls. Did you know some of them were Roman Catholic?
I did run out of time so if you want more lookups please ask.
