Is there a government or state body that could help me?

My father died in June in the USA. My oldest sister had power of attorney and handled all financial matters for him. Apparently most of the money left over has been eaten by bills, however she emailed me on July 10 telling me that she was going to give my other sister $5000 on the Saturday and deposit that same amount into my bank account. She did take my other sister $4000 but did not put anything into my bank and has not answered any emails I sent gently asking about it. Is there anything I can do without having to hire a lawyer in the US which I can’t see doing? I’m sort of distressed because I told my son I would finish his driving lessons with it-