looks like she wrote Annetta on the photo to Enid, Dick and Linda Jane

1910FCI Robert+Harry Wetherill, PA Lackawanna; Throop Boro; District 142; image 37 of 103 @ancestry.com; Series T624; Roll 1358; Part 1; Page 182A; Source Citation: Year: 1910; Census Place: Throop, Lackawanna, Pennsylvania; Roll T624_1358; Page: 19A; Enumeration District: 142; Image: 365.
Harry Wetherill 32
Anna Wetherill 29
Arnetta Wetherill 7
also on same page
Robert Wetherill 37
Catherine Wetherill 34
Robert Wetherill 7

1920FCI Harry Wetherill & fam; Pennsylvania > Lackawanna > Throap > District 207; image 2 of 20 @ancestry.com; Source Citation: Year: 1920;Census Place: Throap, Lackawanna, Pennsylvania; Roll T625_1581; Page: 1B; Enumeration District: 207; Image: 916.
Harry Wetherill 41

Washington, Select Death Certificates, 1907-1960 @ancestry.com
Source Information: Ancestry.com. Washington, Select Death Certificates, 1907-1960 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2014.
Original data: Washington, Death Certificates, 1907-1960. Salt Lake City, Utah: FamilySearch, 2013.
Name: Arnetta E. Wetherill; Gender: Female
Age: 40; Estimated birth year: abt 1904
Death Date: 25 Jul 1944
Death Place: Walla Walla, Walla Walla, Washington
FHL Film Number: 2032395
Reference ID: 264

Pennsylvania, Veterans Burial Cards, 1777-2012 Series 3 (Miscellaneous WWII, Korea, and Vietnam) Werteen-White; image 476 of 1201 @ancestry.com
Source Citation: Pennsylvania Historical and Museum Commission; Harrisburg, Pennsylvania; Pennsylvania Veterans Burial Cards, 1929-1990; Series Number: Series 3
Source Information: Ancestry.com. Pennsylvania, Veterans Burial Cards, 1777-2012 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2010.
Name: Arnetta E Wetherill
Death Date: 25 Jul 1944
Military Branch: Army
Veteran of Which War: World War II
Registration County: Lackawanna
Cemetery Name: Union Cemetery
Cemetery Location: Peckville, Lacka Co, Pennsylvania
service 11 feb 1943 to 25 july 1944
Army Nurse Corps 2nd Lt.

-http://genealogytrails.com/penn/chester/military/WWII_casualties.htm
World War II Honor List of Dead and Missing Army and Army Air Forces Personnel
Chester County PA

-http://dsf.chesco.org/heroes/wetherill/wetherill.htm
Chester County Hall of Heroes Virtual Online Memorial
Arnetta Edna Wetherill was born on October 27, 1904 in Olyphant, Pennsylvania, near Scranton. Arnetta attended local schools, and after graduation, attended nursing school.
She traveled to Chester County as a nurse, and joined the Army Nurse Corps on February 15, 1944.
She was assigned to work at McCaw general Hospital in Walla Walla, Washington state, located in the southeast portion of the state.
Arnetta was commissioned a Second Lieutenant and worked as a surgical nurse, and later as a fever therapy nurse. On June 1, 1944 she became a patient, having contracted an infectious disease.
Second Lieutenant Arnetta Edna Wetherill Died Non Battle while on active duty, on July 25, 1944.
She was awarded the World War II Victory Medal, and the American Campaign Medal.

http://www.gentracer.org/powcampsWA.html
This list of Prisoner of War Camps, Italian Service Unit Camps, and Prisoner of War Hospitals is based on weekly reports located on NARA microfilm #66-538 (population lists June 1942-June 1946). Additional locations based on newspapers, interviews, and other NARA records (at College Park and Regional Archives).
The POW Camps in Washington during World War II included:
*McCaw (Walter D.) General Hospital, Walla Walla, Walla Walla County, WA (branch camp under Lewis, WA)