O'Connor (& McCrossan) family of Philadelphia

My great-grandparents Arthur and Anne O'Connor (ne McCrossan) emigrated from Newtownstewart, Co. Tyrone, Ireland in 1886 with their infant son, leaving their daughter Cassie (my grandmother) behind to be brought up with her maternal grandparents. Their son and three other children died in infancy - 3 were buried in St. Denis' Cemetery ,Havertown, Delaware County; the other in Cathedral Cemetery. They had two daughters who survived into adulthood - Mary J. O'Connor (born sometime between 1886-1888) and Anna (born sometime between 1890-1896). Arthur was a carpenter - the family first lived in 859 Brooklyn Ave., Philadelphia and later in 4249 Westminster Avenue. Arthur died in march 1925 and was buried at St. Denis. The last mention I can find of his daughter Anna was in his Naturalisation papers from 1916. She may have left home and got married - there is an Anna Ford of the correct age buried in St. Denis - could be her? Anne & Mary J. lost their home (Westminster Ave) in the Depression in 1937 and may have moved out of the city. I would love to know more if anyone can help!