All the records are listed on Ancestry. Daughter Winnie's Death Certificate is shown on her profile. Daughter Mary's birth record is an index record. The source citations are listed on the posted sources. The one record I didn't find was her marriage record(s). Her name is listed as Pendergrast on Winnie's death record & as Corbet on daughter Mary's birth index record.
If you look closely at the 1870 census you will see that she was living with William Pendergrast (unsure of relationship).