Mus = Brei? 10:49 Jun 15, 2011
I know "Mus" as any kind of boiled and *pureed* food - such as apple sauce, mash potatoes (in my dialect: "Kartoffelmus"), nut puree, a.s.o.
Have never heard of "Getreidebrei" or "Haferschleim") being referred to as "Mus", but this might be a specifically Swiss thing.
Of course, Nicole is right in saying that sick people are often fed some kind of oat soup or porridge. (Then again, the woman in your story might be served mash potatoes or a vegetable puree... Who knows.) | 
The translation workplace 
peer agreement (net): +9