As for politicians, local is fine, but statewide would be better. They tend to have more resources, staff. C&Y is most probably a state branch, so someone at the state level would be more effective in stirring things up.
If the family knows the police chief, he may need to stay out, as he's too close. However, the police chief could drop some names for State Police, State Attorney General's office, etc.
I have solved several issues by contacting my state congresswoman and involving my state's reps to Federal Congress. If you beat every bush you can find, someone will fall out.
Good luck in obtaining the medical records this week. With those in hand, an objective review is imperative. Find the most reputable pediatrician in the state and let his office know what's going on. If there's a possibility of favorable media mention for them, chances are they will agree to a review of the medical records.
St Simons Island is great, but I much prefer Edisto Island, just south of Charleston, SC. It's home, so I'm not really objective. I know it will be hard for your fiance, being away during all this mess. Hopefully he'll gain some clarity, peace and inspiration that close to the ocean.
