Hey Karen - I had a thought - tho don't know if this could have anything to do with it.

Regarding scents and her sniffing around more outside. Maybe it stems back to Sparky. I'm sure most of his scents outside have been eliminated by the weather - rain, sun, etc, where inside the house the scents of him are still very strong on the furniture and carpets - even tho the carpets have been shampooed. Maybe she's actually looking for him and leaving her calling card??? I don't know!!! - kinda far fetched but not impossible I suppose. Who knows what's going on in that little Pommy head of hers?