From Aleteia:
They would be disappointed of course. They wanted to see her one more time before she left for New York. They were also working to secure passage for her, Sister Antony, and Sister Mary aboard this grand new ship that was to depart from the port in Southampton, about a day’s ride to the south of the Convent in Honor Oak, which is near Charing Cross Station.
Perhaps it was Mother’s frail health, or perhaps it was the urgency with which she felt compelled to cut her trip to Europe short due to new challenges facing the expansion of Columbus Hospital, or perhaps, more probably, it was Divine intervention. Whatever it was, it prevented Mother Frances Xavier Cabrini from setting off on her journey to London to board the R.M.S. Titanic, and put her aboard the SS Berlin in Naples bound for New York instead. It spared her life.
