I have not checked with Boston and to me it would make sense that they are buried close to Hyde Park. I am not sure how they would have transported them to Webster in 1890/1891.
Her husband died in Ireland and it was shortly after that, that she made the trip to the US. They had settled in Thompson, CT just over the border from Webster. I may walk the Catholic Cemetery in Dudley when time allows. The only problem is I know she was in dire straights (like many of the Irish) at the time so I am not sure if they could afford a headstone.
Her daughter Bridget (my great grandmother) is buried in West Roxbury at St. Mary's. Their records only show 4 people buried at the site. However I have death records to show there are at least 7 people buried there. Three of the individuals buried there are my grandparents and uncle. I know they are there as my mother was at the funerals and showed me the exact spot next to the headstone. St. Mary's records are "poor" at best. Thanks for the advice. Paul