I have a Myra Clark Hart in my database. She was born 10-1-1877 in Hunt Co., TX. I found her death notice because she was wife of William Harvey Keller, a brother to my g-grandmother, Margaret Keller Blanton. Anyhow, you might want to look at Myra's family. I don't think she had 10 sisters, but I never focused her ancestry so really don't know.
Greenville Messenger, Friday, Dec. 20, 1918, p.2
Mrs. Keller, daughter of the late "Uncle Billie" Hart of Wieland, died at Bells last week; the body was carried to Wieland for burial.
Some records show her dod as 12-11-1918; however, her Texas Death Certificate reveals that Myra Clark Hart Keller died in Grayson Co., TX on 12-10-1918 and that she was buried in Hunt Co., TX