Let me use some common sense for this.First, we need her date of birth, or approximate.So, using the census information below.She was born late 1899 to very early 1900.This is based on her age and the date of the census enumeration.Since the 1920 census was enumerated on January 5th and she was listed as 20 (yes there are age errors on the census), she "probably" was born in 1899 or the first 4 days of January 1900.
So, based on that, the second of the two found by the other poster, "Shotgun", could not be the right person.In 1930, there were 37 "Mary Goff/Goffe/etc."
The 1930 Census had a Mary L. Goff in Portland, she was born about 1922.That census was enumerated on April 9th.So, the first one "found" is not correct either.
I looked in the 1930 Census for both or either of them.I found no Mary Goff* (where * adds any letters following) born plus minus 5 years of 1900.No findings.
If you have the marriage certificate, it might further identify Henry (I also searched for Harry as a common sub-name).His DOB would help.ANY additional from Colorado on them would help.Did they have children in CO?
As far as for Sandy, Oregon...pretty hard to find them from here.Try the volunteers at the Random Acts of Genealogical Kindness, you can only email one at a time.But, one might have access to local Sandy, Or, records, possibly city directory (Polks), if it is big enough to have had one.
As far as death certificates, marriage, etc. Oregon has privacy laws that might hurt your search, so, you'd have to ask for local help.
Below is Census records that you may or may not have already.
The 1910 Census for Rollinsville, Gilpin COunty, Colorado, enumerated 19 April
James A Retallack, age 41 (1868/1869), born in England, immigrated in 1887, blacksmith in his own shop, married 11 years:
Mary Ann, age 30, born in Colorado, mail carrier on a Star Route.Mother of 3, all living:
Mary E, 10
James W 8
Margaret G? 6.All children born in Colorado
The 1920 Census for Rollinsville, Gilpin Co
James W Retallack, 18, step son
Gertrude Retallack, 16, step daughter
living with Mary (probably their mother) 40, now married to Albert A. Ecker.
The 1920 Census for Tolland, Gilpin County, Colorado, enumerated 1/5/1920.
Mary Retallack, age 20, born in CO, to father born England, mother born CO, Servant in a boarding house.The house owned by Emma Parsons age 63, born in Illinois and her brother Fred Frike 53, born in Nebraska; both of their parents born in Germany.