A. It could be a mild viral infection, however given that it's only on one side I'm worried about a problem up in that side of her nose. Infections usually cause bilateral, not unilateral, discharge. I would take her in to have her checked for something that's causing a problem on that one side - a foreign body maybe, hopefully not a tumor but that should be considered as well. And depending on where you live fungal disease may be a concern.
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