It's not the worst thing, in an open area. I love the mixed smells of barns too. Closed in a tight space, it can be a bit lethal!
She has the routine down pat - even uses one corner now and steps aside as soon as I enter. I think she likes it better clean - and it's easier on the shavings.
Do y'all use shavings or straw in the Pac NW? Sitting in the middle of pulpwood territory like we do, everybody uses shavings because they are actually FREE if you go to the mill to fetch them.