Well if she is not "shooting" which usual occurs by excitement, or marking of sort then I would guess she has an undying problem. Perhaps an still allergy or inflammation of the glands that hasn't been resolved. You also could be controlling her allergy and this leakage is just symptomatic since it occurs infrequently. In other words she still has allergies but they are being controlled as allergies really never go away. I guess if it continues to be a problem I would talk to the vet .