The Mysterious Mary Black

I am interested in finding any information about my gr-grandmother, Mary A Rouse, nee Black, nee Rolison, born March 1853. Her parents, Benjamin Rouse and Elisabeth Black presumably died around 1865-1870 and Mary and her two Brothers, John and James and two sisters, Martha Matilda and Catherine were let out for adoption. Mary married my gr-grandfather, Decker A Roleson (Rollison, Rowlandson, Rolison, Roloson, Bolison) around 1870 and the children were Matthias Roleson and Joseph Elias Roleson, my grandfather. Mary disappeared when my grandfather Joseph was 18 months old. My family's reference to her was always as "Mary Black" who took "French-leave" and deserted her family. I found a reference to her in the 1885 New Jersey Census as staying with Jacob Rutan and his wife, Nancy Roloson Rutan.