I did find one newspaper article regarding "Jennette" Rankin's trip to California in 1911.
From Woodland (CA) Daily Democrat 31 Aug 1911
I found quite a few articles using the spelling of her name as Jeannette Rankin, which I think is the correct spelling. One sample of those is from the El Paso Herald 22 Aug 1911:
If she is the Jeannette Rankin, who was the 1st woman elected to Congress, then there is an FBI file on-line
Her personal papers seem to be housed in several archives:
Swarthmore University https://www.swarthmore.edu/library/peace/CDGA.M-R/Rankin.html
University of Georgia http://russelldoc.galib.uga.edu/russell/view?docId=ead/RBRL325-ead.xml
Archives West http://archiveswest.orbiscascade.org/ark:/80444/xv99526
Thank you so much for your reply. Yes, the correct spelling is Jeannette, but our local newspaper got it wrong, as usual, and I didn't catch myself when asking the question.
I had the Woodland Democrat article and the Archives West link is the finding aid for the Montana Historical Collection, which only had records from 1912 forward. The Swarthmore University Collection starts in 1917 and the Harvard Collection skips the year 1911.
I did dip into the FBI files and they start in the 1940's during WWII and go through Vietnam and seem to mainly cover her peace work, parades etc.
I was not aware of the collection at the University of Georgia and I just downloaded their finding aid...there is one folder of Correspondence that cover the years from 1914-1940. I think I will be very lucky if it contains anything for me...but fingers crossed.
Again, thank you for your efforts on my behalf.
I found one article about Jeanette Rankin's trip to California in September 17, 1911
Thank you for the reference. It helped by eliminating some dates for me.