According to the Boise Public Library's obituary index, Catherine Davenport Perez's obituary can be found in the Idaho Statesman, issue date of March 10, 1990 on page 2C & issue date of March 12, 1990 page 2C.
There are several places that will provide a copy of this obituary for you (for a small fee). Here are links to them:
Boise Public Library Obituary: http://www.boisepubliclibrary.org/research/obituaries-local
Idaho State Archives Email Request: firstname.lastname@example.org
Caldwell Public Library: (208) 459-3242, Website: http://caldwell.lili.org
Please provide the decease's name, the name of the newspaper, issue date, and page # where the obituary can be found.
Happy Hunting! Virginia (Doughty) Vaught