She might have seen Cambion on the park (not that he was following her, or had any sort of interest in her daily routine whatsoever, why would anyone think that?) or on her run back, because he'd been consistently within eyesight, although not actually echoning her movements. He did head back for the Manor when she did though, trotting a respectful fifteen or so feet behind her, and entering the lobby shortly after she did.
For a man who had been engaged in relatively vigorous exercise for the last hour or so, he was disgustingly un-flustered.