I don't know where she's buried, but I do know she was born in Maryland. Would it be:
I'm not sure about the marriage problem one, but I'll guess "Barefoot in the Park".
"The Quiet Man" for the arrogant Irishman, Victor McLaghlin?
I just saw her in "The Enchanted Cottage" with Dorothy McGuire, Herbert Marshall and Robert Young on TCM the other day.