It would be helpful if we had her name and some basic information (birth year & place, husband's name, etc) about her, so that perhaps we could help you find the information you are looking for.
Elizabeth Sadlo, born 1901 in Poland. Husband's name was Joseph Sadlo.
Unfortunately I am not finding anything about her after the 1940 Census, which make me wonder if she remarried at some point. The 1950 census should become available to the public April 2022. He husband, Joseph, was killed by a drunk driver in Jan 1940 and her son, also named Joseph, died in WWII. I looked for obituaries of the people the children were living after her husband died to see if Elizabeth was mentioned, but she was not. I also looked for Zondlak (her maiden name) obits in Chicago to see if she was mentioned, but again she was not. She is not listed as Elizabeth Sadlo in the Chicago, death records index 1909-1994 https://www.familysearch.org/search/catalog/2305942?availability=Family%20History%20Library
Dear Ms. Connelly,
Thank you for posting your request on History Hub!
The Federal Government does not ordinarily create or maintain birth, death, marriage or divorce records. Such records are made and kept by State and local governments rather than the National Archives. We suggest that you complete an Application for Search of Death Records Files from the Illinois Department of Public Health as well as search the United States Social Security Death Index. The Illinois Division of Vital Records can verify the facts of a marriage that has taken place from 1962 through the current index date available. The facts of a marriage include: names, dates of birth, date of event, and city/county of event. You also may wish to submit an Application for Verification of Marriage Record Files to determine if Elizabeth Sadio remarried.
Most cities and counties have yearly directories for residents which can be searched by name. We suggest you consult the FamilySearch Research wiki on Illinois Directories for these resources. You may wish to search Ancestry.com for these directories as well. There may be a fee for using Ancestry. Instead, check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
The Illinois State Archives in Springfield has Chicago State Hospital’s admission and discharge records from 1920 to 1951, but you need to obtain a court order to see them. Please refer to this unofficial article for guidance - Help in Accessing Closed Records of Illinois State Mental Hospitals.
We hope this is helpful. Best of luck with your family research!
I noticed in the 1930 Census that they owned property. That would have to be disposed of in the event she was no longer living. I would encourage you to see what was done with the property after Joseph died.
Did you also see if she is buried by him? They may not be listed on findagrave, so I would encourage you to contact the cemetery and see who paid for the plot.
Washington State Archives