julia ware was driving before crash in paupack township , pennsylvania .
chevy suburban rolled over several times during deadly august accident .
three passengers ryan lesher , shamus digney , and cullen keffer were 15 .
ware accepted responsibility for three homicide by vehicle felony counts .
pleasantville , new york , girl also admitted to two misdemeanor charges .
father faces charges for allegedly letting his daughter have keys to suv .