It is a mystery

If Mara's blowing her coat in late July-into August that might go with "seasonal picky eater" as "heat stress". I have seen dogs fed cold soup when it's hot but you really don't want to do that inside (or without a hose for afterwards!) Try freezing some wet food, seeing if that goes over better?

(Also, if you ever have an actual recipe for "Oat something-or-other" you should publish it just because that is the most grandma's-little-index-cards recipe name ever.)