Here is her probable grave:

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSln=Ha...;


1920 Washington State King County Seattle District 93

BROOKS Edward, head, 38, married, born West Virginia, parents born Switzerland, lineman, City light company

BROOKS Carrie, wife, 35, emigrated 1902, naturalized 1918, born Denmark

HANSEN Elsa, mother-in-law, age 75, widowed, emigrated 1902, not a citizen, born Denmark

This would indicate she possibly died in King County, WA.