Probably actually Nellie VAUGHN. Listed as "Margaret VAUGHN" in commencement news clip (above).
in 1910 census, listed as youngest child (daughter, 13 WI), 6th of 5 children [sic] of Jacob and Sarah Ellen (JOYCE) ELGEE. See more family information.
In 1920 census, listed as Nellie T VAUGHN, niece, 22 WI, single, bookkeeper, in home of Jacob & Sarah ELGEE. --1920 Cd'A ED206 p14A, 569 Cd'A Ave. Her future husband Frank DAWSON, 29 WI, lumber grader, lived with his widowed mother at 708 Indiana.
In 1900, also 1905, and 1910, Francis Michael DAWSON (Frank), born 23 July 1890 in Chippewa Falls, lived with his parent(s) and sibling(s) at 14 State St, Chippewa Falls WI. Frank's mother immigrated from Canada in 1884, and was naturalized in 1890.
Nellie ELGEE married 12 Jun 1923 to Frank M DAWSON at St Thomas church. The parish records show Nellie is the daughter of Michael and Jane (JOYCE) ELGEE. Frank is the son of (Martin) Michael and Ellen (JENNINGS) DAWSON. Nellie is listed as a sister of John H ELGEE, and Frank '12 ELGEE, in John's obituary.
In 1930, Nellie, 33 WI, and Frank, 36 WI, parents b Canada, lived in Lewiston. Frank was a foreman in a lumber mill, and owned 317 Miller St (value $2800); no radio. children: Mary J, 5, and Francis V, 23mo. The family still lived there in 1940. Frank died at Walla Walla on 6 Oct 1941. Nellie died on 17 July 1987.

born Dec 1894 IA, to John HILLIS (b Aug 1866 IA KY TN, day laborer) and Lynthia (STEEN) (b May 1870 IA OH IL, married c 1888); siblings Burton Earl (May 1889 IA), Robert Emory (Mar 1891 IA), and Wallace (Mar 1893 IA). —1895 census, Harrison County, Iowa; —1900 census, Dayton, Columbia, Washington, ED7 p21B Wallace, 17, was a restaurant cook in 1910 in Spokane. Robert married on Christmas Day 1919 to Jennie F HALE at Walla Walla. Robert died there 18 months later, on 23 Jun 1921.
Bernice was a boarding student at the Academy in 1910. Sr Harriet, IHM — profession 3 Jan 1918, died 3 Dec 1967, bur St Catherine Cemetery, Moscow PA. --1920 census, Susquehannah PA, Laurel Hill Convent, ED95, p23A
Burton E HILLIS died 22 Feb 1942 at Walla Walla.

born 24 Dec 1894 in Northwood, North Dakota to William D and Myrtle (CORKINS) HENDRICK. Entered IHM's in Sept 1915, was professed 3 Jan 1918, and died 10 Dec 1966. She is not on the 1915 photo montage, but appears to have been in this class.
In 1901, the family lived in Kootenay BC CAN. (See 1901 census.) Marian's father died there in 1906. Marian was not a student at IHM in 1910, so probably came for HS only.

born 1 Mar 1897, died Aug 1974 NJ. Siblings include Sheldon '10, Bessie '18, Neil '23 & Robert '28. More family information.

Justin'15

Harold Francis, born 24 Feb 1895 in Zilwaukee MI to Cornelius Francis (b Jun 1860 MI, sawyer) and Almeda (ROUTIER, b Nov 1870 MI) SPAIN. Siblings Rolland Daniel (born 21 Feb 1893 MI), Lorne Rae [or Rena H, or Irene] (b Sep 1897 MI), Everett C (b Feb 1900 MI), and Ruth M '28 (b 6 Sep 1908 ID). --1900 census Saginaw MI, ED78 p4A; 1910 Cd'A, ED173 p23A, Riverside Ave; MI birth records.
In 1860, Cornelius F SPAIN lived in St Clair county MI with his parents, Cornelius 37 IRL, shoemaker, and Elizabeth 39 IRL, along with siblings Mary Ann, Edward, Margaret, Catherine, & Sarah. --15 Aug 1860, Kenockee township, p 280.
In 1870, Cornelius F, 10, lived in Zilwaukee, Saginaw county MI with his parents, C F (b c1820 IRL) & Elizabeth (b c1821 IRL) and siblings Edward 19, Margaret, Catherine, Sarah & Daniel 7. See census transcript and image.
In 1880, Cornelius F lived with his widowed mother, and siblings Edward, Sarah & Daniel, in Zilwaukee MI. --see census transcript. Elizabeth (-) SPAIN, born 1816 IRL, died 10 Jul 1882 in Zilwaukee MI. | Almeda ROUTIER lived with her parents, also in Zilwaukee MI. --see census transcript. More ROUTIER family information is available on WorldConnect.
On 25 Nov 1891, Cornelius SPAIN, 31 (sic), son of C SPAIN & Mary DOYLE, married Amelia (sic) ROUTIER, 22, daughter of Augustus ROUTIER (and Harriet GENEREAU), in Carrollton, Saginaw, MI. --View the marriage register.
In 1900, Harry lived in Zilwaukee MI with his parents and siblings Rolland, Rena & Everett. See census image and transcript.
In 1910, the family lived in Cd'A, on Riverside Avenue.
In 1917, Harry and Rolland registered for the military draft in Idaho in 1917 and reported birthplace as Saginaw Co MI. Harry worked at the Morning Mine, near Mullan (see registration card. On 15 July 1917, he married Irene J MONAGHAN at Hot Springs, Sanders, Montana. She is a daughter of Hugh and Lilly (ELLIOTT) MONAGHAN.
On 2 Jan 1920, Harry was a grocery store salesman in Kootenai ID, living with his wife Irene J, age 22 born 7 Oct 1897 MT, parents born NH and MI. --1920 census, Bonner Co ID, Kootenai pct, ED218 p1A
On 31 Dec 1923, Harry's brother Everett married Kathleen TURNER at St Thomas church.
On 13 Apr 1930, Harry and Irene, with daughter Priscilla '48, 6 months, own and live at 1303 Wallace Ave. Harry was secretary for a labor union. --1930 Cd'A ED11 p14B; see transcript)
On 1 Sep 1934, Ruth Marie '28 SPAIN married J Aldwin SCHMIRLER (non-Catholic) at St Thomas parish, Cd'A.
Almeda died 19 May 1939; Cornelius died 16 Jun 1943, both died in Kootenai County, and are buried in St Thomas cemetery.
Harry died in April 1985. Irene died in May 1977. Roland D died 27 Dec 1918. Irene, Roland D, Harry Jr (infant, 1922) and Roland Francis (child, d Dec 1924) are buried in St Thomas cemetery . Harry's sister, Lorna/Rena/Irene Harriet, born 16 Oct 1897, married at St Thomas parish on 26 June 1933 to Charles PROELL, and died in Spokane on 19 Apr 1991. Her husband, Charles PROELL, died in 1970. They are buried in Holy Cross, Spokane.

Holy Cross:
PROELLs