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If she is having mild to moderate sharp abdominal pain associated with a fever of 101.4, the most likely cause would be a viral infection of the GI tract. If the pain is more severe, that would be more concerning. If the pain is close to edge of the right rib cage, that would be worrisome for gallbladder disease. If it is more severe pain, there are several other possibilities to consider, such as appendicitis, diverticulitis, or pancreatitis.
If the pain is mild to moderate in severity, it would be reasonable to use acetaminophen tot ry to relieve the symptoms and see if the problem resolves spontaneously as would be expected with a viral infection. If the pain is more severe, then it would be better for her to be seen.