ORIGINAL: mondayblues
Is she fully housetrained or is she a rescue you are in the process of re-training? It could be behavioral and it could be medical. When she gets let outside, does she actually pee? Also, you should probably cut off her access to the bedroom while you and your husband aren't in it.
Ditto, great advice. In addition when could be medical related (which I highly suggest you check out). Even if she seems fine she could be trying to tell you something. Think about it, when you have a bladder infection you still feel ok, eat, sleep all that. She has no way of telling you if she feels icky so this could be it.
As for behavorial I hear of this happening when the dog is stressed or their has been a recent change, typically when a second animal is aquired, DH has been away and comes home, or a new move. Has anything like this happened recently?