whay can i do legal for a count of hospital and nursing home which account for the death of my sister?

sister fell on public street. The police officer called his wife what to do(manager of the housing complex where my sister lives) tell her if she does not go to the hospital she will go to jail for public drunkness. She did not want to go to jail. She had fallen the day before but they let her go home. she never came home. They tried to put a feeding tube down her it go infected she was hospitalized 25 days . the hospital or no one would give no information on my sister .They called DHS ( distinctive human services). they had all the say so. we never made it to court for full custoday she passed away 14 days before the hearing..It is going to be 2 years May 28,2019. I need answers... all from the police department Hospital, Nursing home, the nursing home has denied the time to of my sisters death saying they never had my phone number much more one the Distinctive Human Services violating my sister and I