St Michael's Orphanage, Hopewell NJ

My mother was placed in st. Michaels orphanage during this time frame. Her name was Ruth Helen Rock. She had a sister by the name of Donna Marie Rock. They were adopted by a family in Whitehouse Nj by the last name of Higgins. Would anyone know of any information related to these two girls? Their birth parents could have been Charles Rock and Irene Rock ne Flannery. Thanks to anyone that could give some info