According to a death record in Worcester there was a Morris & Mary Fitzgerald that lived on Pine St. when their daughter Mary Jane, born about 04/21/1855, she was 2 years and 4 months old when she died on 08/21/1857 of Dysentery. She was buried at Tatnuck cemetrey, see posts on this forum about Tatnuck. I haven't looked for her birth record.
See: Search for missing Friends 1861