"Assuming" her name "Buckley" was her maiden name:
The 1900 Census for Salem, Dent County, Missouri Laura Buckley, born April 1883 in Missouri to both parents born "Unknown", working as a servant in the home of Niel J. Jones, born Sept 1862 in Tennessee and his wife Margaret, Dec 1860 in Indiana. --This Laura matches the birth in April, but this year of 1883 is one year earlier.But, do not eliminate her yet as the census is filled with errors of year of birth.
I find a William Anderson Bailey, born 18 Sep 1885 in Dent County, Missouri, son of George Washington Bailey and Paulina Elizabeth Fink.He was married to a Laura Buckley.He died in 1921, place unknown.
This is the only William Bailey that I found that was married to a Laura, and this one happened to be married to a Laura Buckley; AND, both were from Dent County, Missouri.Obtaining their marriage certificate might be your answer."Sometimes" in earlier marriages, the name of the parents were listed in some States or Counties.
If she was your great aunt, who were her siblings?If they can be found in the 1900 Census, one of them might still have been living at home.Provide the names and birthdates of your Grand-mother or father, and any other siblings information that you know.
Laura's Social Security Number was issued in Nevada before 1951.There is no way to determine how long this person had been living in Shasta County between the years of before 1951 and her death in 1970.Do you know any of her family that was living in Shasta County?It would also help to identify the full information of the "Long" to whom she was married.