I've confirmed your supposition! According to her death certificate, Ohio Vol. #3533, Certif. #15411 available through the Ohio Historical Society, Loueen Pattee died 3/7/1921. Here is the rest of the info from the death certificate:
Place of death Hamilton Co., Cincinnati, Christ Hospital. Full name Loueen Pattee, resident Delmoor Aptmt. Personal and statistical particulars: Female, White, Single. Date of birth Jan. 13, 1875.Age 46, 1 mo., 22 days. Occupation: Teacher - Dean of Women, Cincinnati University. Birthplace: Buda [looks like this, from handwriting] Illinois. Name of Father: Harrison Pattee. Birthplace of Father: (indecipherable - xxx) Grove, Illinois. Maiden name of Mother: Elizabeth Brown, born Ottawa Illinois. Informant: Fred Pattee, Evanston, Ill. Medical certificatio of death, date of death: Mar. 7, 1921. I attended deceased from Mar. 1, 1921 to March 7, 1921, that I last saw her alive on March 7, 1921, and that death occurred, on the date stated above, at 1:54 pm. The cause of death was as follows: broncho pneumonia, duration 11 days. Contributory (secondary): influenza contracted in N. York. Where was the disease contracted if not at place of death? New York City. no autopsy. Signed... Place of burial, cremation, or removal: Cincinnati Crematory, date of burial Mar 9, 1921. Undertaker G. A. Wiltsee, 24 W. 9th.
I did also look at the 1920 census for her, there in Cincinnati on Telford Ave., and I agree that the census taker got her age wrong. My guess is that the census taker or the information giver listed the year of birth (74) rather than the age. This is probably also true of the the other person in her household, Mary MacMillan, who was listed as "head" and Loueen as "partner" but then that scratched out and inserted something else that looks like it could be boarder (same thing later on the page for two other women school teachers.) FYI, Mary MacMillan 1870-1936 was a writer and poet who was apparently an active proponent of woman suffrage, from my googling work.
Also, I confirmed with Grinnell College that Loueen was a 1908 graduate (at the time, the college was Iowa College) and that her bachelor's degree was in German and French. In the commencement booklet, she was listed as coming to the college from Munich Germany, but her name does not appear in catalogs prior to the 1907-08 year. She was in a 1918 alumni book with the occupation "teacher in a private school, Friedrichstrasse 9, Munich."
There is a photo of Loueen in the 1920 Cincinnatian, the yearbook of the University of Cincinnati, and also in the 1921 volume where there is also a Memoriam page a copy of a resolution from the Student Council that expresses their sorrow and a tribute, and that they send a copy of such to her brother.
Finally, she wrote and published a small but wonderful story about a couple of her students. It is "A Muted Message" by Loueen Pattee, and appeared in The Outlook for Feb. 14, 1917.
FYI, I began looking for her because I study early deans of women involved in early professional organizations. Dean Pattee attended a 1917 meeting of deans of women Goucher College and Trinity College, and was also a member of the Association of Collegiate Alumnae.