Limited info was given by the local harbormaster in regards to this accident.  A family had just put their boat on a mooring when their 12 yr old daughter started the boat which was running high so her father told her to throttle down.  She reached for the throttle and hit the gear level and the boat lurched forward putting her into the water.  The vessel was circling her at full speed.  She had the engine's kill switch attached to her pfd but it came off at the pfd end.  Her father dove in the water and got to his daughter and pushed her under 3 or 4 times so the prop would not hit her.  Her father was injured  The daughter's bathing suit was pulled off her and her pfd had a cut on the back. 
Weymouth                      