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I assume that she was not spayed recently; if she was spayed within the past few days then this could be associated inflammation which may resolve in a few days. Just wanted to clarify that the two are not related.
The most common cause of what you describe is that she may have a urinary tract infection (bacterial is most likely, although fungal infection is rarely possible). This is something easily diagnosed by your veterinarian but is going to require a trip to see your vet since the treatment is prescription medication.