The best match I can find for Catherine's entry into the U.S. was in 1891:
September 1891, ship Catalonia, from Liverpool to Boston, Massachusetts.
Catherine WARD, age 20, female, spinster, born Ireland, traveling to Massachusetts.
The entry below hers is for an Annie WARD, age 16, female, spinster, born Ireland, also traveling to Massachusetts.
Could you add more information for her sisters Bridget and Margaret? Birth dates and when they emigrated?