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When it first appeared (this morning).
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Her level of pain (scale of 1-10).
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That she cannot move her foot.
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Any recent injury, new shoes, or insect bites she may have had.
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Any fever or other symptoms.
This is a situation where it is always better to err on the side of caution. Her inability to move her foot changes everything. Please seek professional medical evaluation without delay to get her the proper diagnosis and treatment, and to relieve her pain.