You need to go to the right office. If you live in Kitsap County, you go to the Silverdale office. If you are there when they open, you will spend a shorter amount of time waiting. Take a book or sewing.
You must bring her death certificate, any birth, marriage license, and if she was getting benefits from them bring that paper work and your 2018 tax return. You will be sitting there half the day and it is no fun if you don't have something they want, you will have to come back and sit in line again.
Go to ssa and let them know, they will tell you how to.
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