I wasn't able to find information on Ruth, However, I did find death records for other children of Isaac and Nola Hughes Hallman.
Dorris Elizabeth Hallman
Residence: Logan, Cache, Ut.
b. Nov. 12, 1918
d. June 26, 1929
Age: 10 yrs.
Cause of death: drowning (accident)
Father: Isaac Powell Hallman; Carrollton Georgia
Mother: Nola Hughes; Conway, Miss.
Burial: Centerville, Ut
Cecil Hughes Hallman
b. Jan. 6, 1923
d. Oct. 5-6, 1938 Salt Lake City, Ut
Age: 15 yrs
Cause of death: Rupture of spleen/Hypostatic pneumonia
Due to Accident on 10/4 on the Centerville Highway.
Father: Isaac Hallman
Mother: Nola Hughes