If you look on the Washington digital archives, there is a marriage license for Margaret Brown. There are also ones for an Aileen o'daniel and a Joan o'daniel. YOu can look to see if you think they are yours.
http://www.digitalarchives.wa.gov/HomeI looked on Genealogy Bank for an obit, there was only a listing with her name and date in the Wenatchee paper. So, there may or may not have been a full obit.
There is also a listing for her at
www.findagrave.com . She is buried in the Wenatchee city cemetery.