We have a PhD researcher who is in the process of looking high & low for the 1921 "Nickle Commission" : "Report on the state and management of the female prison at the Kingston Penitentiary."
There was another report previously issued in 1921 from the "Briggar, Nickle and Draper Commission", but that one, from what I gather, was called the "Report of the Committee Appointed by the Right Honourable J.C. Doherty, Minister of Justice to Advise Upon the Revision of the Penitentiary Regulations and the Penitentiary Act, Feb. 28, 1921" and because it came first, would probably not contain the one about the women's prison. However, I may be wrong about that. It was re-issued in the 1940's, so perhaps the Nickle Commission was appended then?
I have only been able to find one location (the Public Safety Canada Library - please see their record from AMICUS, below) but they have informed me that they no longer have the item.
Does this information exist? If you do possess a paper copy, and if it is possible, we would love to enact an ILL, but even if the researcher had to go to your library and peruse the report on-site, at least we would know that it still exists somewhere in Canada.
NICKLE COMMISSION REPORT…
As noted, apparently no longer available at the Public Safety Library.
AMICUS No. 22534404
NAME(S):*Nickle, W. F
TITLE(S): Report on the state and management of the female prison
at the Kingston Penitentiary / by W. F. Nickle
PUBLISHER: [S. l. : s. n.], 1921.
DESCRIPTION: , 35,  leaves : plans ; 36 cm.
SUBJECTS: Prison for women (Kingston, Ont.)--History
Reformatories for women--Ontario--Kingston
Reformatories for women--Ontario--Kingston--Management
Library Symbol: OOSG
Library Name: Public Safety Canada, Library and Information Centre
I found a citation to the report here: http://journals.hil.unb.ca/index.php/acadiensis/article/view/12733/13663
“In 1921, the women’s prison was the subject of an investigation about the behaviour between the women and male guards, notably those making their way to the tower. See “Report on the State and Management of the Female Prison at the Kingston Penitentiary by W.F. Nickle,” Solicitor General fonds, RG 73, vol. 105, file 4-1-14, LAC; for a description of the women’s penitentiary specifically, see pp. 1-3”
It looks like LAC might still have it, but it wouldn’t be listed in AMICUS (because the copy is part of a fonds). It doesn’t look like it has been digitized, but you could double check with them.