Daughter has sudden pain for no apparent reason

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My daughter was walking through the living room when she fell to the floor complaining that her left foot had sudden pain. She didn't step on anything or seem to misplace a footstep. Her foot is slightly red and the veins seem more pronounced last night, but today looks fine. Pain is still there and I had to pick her from school early. The pain is in the big toe, through the ball of her foot, and into the arch. Any idea what this is or what it sounds like? Thank you for your help.