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Please allow me to copy my reply here for your review:
It is possible that she has torn a ligament in her foot.
I recommend that she keep her weight off it (using crutches) and, if it doesn't show some improvement by the end of the week, have it examined by an orthopedic surgeon.
In the majority of cases these things heal up given time and by keeping the weight off of the foot but, if she still has significant pain with weight bearing after 3 weeks it should be looked at again, possibly with an MRI if the orthopedic doctor thinks it is indicated after examining her.
Does this make sense to you?
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