If I was in Seattle I would go to Trader Joe's on Capitol Hill and grab at least a sixer or bomber of every microbrew they carry! I did this last month and there was nary a bad one, even at $5.99 a six pack. They are not Seattle brews but a trip to Trader Joe's is an awesome experience all by itself.
Also on Capitol Hill is the Quality Food Center, which has a mind-blowing selection of microbrews and specialty brews. Not only-in-Seattle, but Seattle brews themselves are rarely only-in-Seattle. You could tell her to concentrate on looking for brands that are brewed in Washington.