RedactedNarrative: Vessel #1 was operating through channel connecting two bodies of water when it was struck from behind by vessel #2.  V1 occupant was the 2nd passenger on the PWC (vessel #1) and she took most of the impact from the crash.  She was thrown into the lake.  Bystanders as well as both operators and passengers got V1 occupant to shore where EMS transported her to Elkhart General for possible broken bones.  No other injuries were reported.  Passengers were not wearing a life jacket.    