RedactedNarrative: Vessel was traveling west on Manatee River.  Vessel turned North when at the mouth of the river and struck a sandbar.  Two of the occupants were thrown into the cabin, one was injured.  Occupant standing to the left of the helm was thrown into the cabin and struck her head on a blue Igloo cooler. No damage to the vessel.; She was complaining of neck pains and was treated and released at Blake Memorial.