Name of father Harry E. Mann
1900 OR CENSUS - Hattie Mann, age 9, b. Feb 1891 in Oregon, is enumerated with father Harry, age 34, occupation rancher, b. Apr 1866 in California, and his wife of 12 years, Lavina, age 26, mother of 4, occupation cook at Indian school, b. Sep 1873 in California, along with, Nora, age 11, b. Nov 1888 in Oregon, Rena, age 5, b. Nov 1894 in Oregon, and Edward, age 2, b. Oct 1897 in Oregon.  Harry is identified as white, Lavina and the children are identified as Indian. 
1910 OR CENSUS - Hattie L. Mann, age 19, b. Oregon, is enumerated [at Salem Indian school] with father Harry E. Mann, age 44, occupation blacksmith at Indian school, b. California, and Sarah E., age 38, mother of 5, b. California, along with  Nora L., age 21, occupation sales clerk, b. Oregon, Lorena [Rena], age 16, b. Oregon, Edward, age 12, b. Oregon, and Marie, age 6, b. Oregon.  Harry is identified as white, Sarah and the children as Indian.

Arizona DC (1914 Maricopa Co) #187 Hattie L. Mann, female, white; b 4 Feb, California; father Harry E. Mann (b California); mother Lavina Barkley (b Oregon); d 25 Jan 1914, N Central Ave, Phoenix, age 22y; lived in town 2m3d; bur Oregon; informant Harry E. Mann, Chemawa, Oregon

MANN - News has been received here of the death of Miss Hattie Mann in Phoenix, Ariz., last Saturday. Miss Mann is well known in Salem, having been chief clerk in Recorder Elgin's office for some time, and formerly a student at the Chemawa Indian Training school. She was 23 years old and leaves a father and mother at Chemawa, Mr. Mann being the superintendent of the blacksmith shop at the school. The remains will arrive at Chemawa tomorrow and funeral announcement will appear later.
Daily Capital Journal 27 Jan 1914, 8:7

LR
J. Plant Register

Arizona death certificate (Ancestry.com)
1900 OR CENSUS (Klamath Co., Klamath Indian Reservation, ED 179, sheet 6A)
1910 OR CENSUS (Marion Co., Chemawa, ED 286, sheet 2B)
DCJ 27 Jan 1914, 8:7