I went down to the Register of Deeds office today and here is what I can tell you.
I looked up Emma's daughter Jennie's death certificate and her mother's maiden name is listed as Emma M. Johnson. I copied down all the information for you. Email me directly at firstname.lastname@example.org
and I will forward the info on to you if you want it,
I also looked again thru the death index and looked thru the names from 1935 thru 1937 and the only Blair listed is the Harry A Blair that I mentioned previously, Specifically, for May 1936 there were only the following people listed: Albert Beranek d. May 16; Lars Biglow d. May 14; Libbie Killian Bowles d. May 15; Harry A Blair d. May 18; Charlotte Baner d. May 19; Infant Blaha d. May 26; Mrs Margery Mundt Bell d. May 10.
Are you sure she died at Jennie's house and not another daughter's house. I looked it up and noticed she was living with another daughter in the 1930 census in Shell Lake. Did you also check Washburn county for a death certificate?