1876-1957 dates of birth and death unverified. (Dates taken from Google lookup of "Kate Block Spoor" and the "results page" lists Kate Block Spoor on Spoor-Ancestry.com).
Sources
There were various family photos of the sisters together. I asked my cousin, Eileen Funk, if she knew who this person was and she gave me the name information. I was able to find more photos of the two together on line.
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DNA Connections
It may be possible to confirm family relationships with Katherina by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Katherina: