1845 passage Bergen to NYC

An obituary of my 3great grandmother, Mari Johannesdttr, contains the following info -- "...she left Bergen, April 1, 1845 landing in New York, July 4th. We can scarcely realize what those 95 days on an emigrant shp, with the barest necessaries of life, must have meant to her. The chase of their vessel by a pirate ship, from which the darkness of a stormy night saved them, was a never to be forgotten incident of this voyage." Mari left from Vik, Norway with a good number of other neighbors. According to the parish records the date of departure from Vik was March 17th so an April 1 departure from Bergen seemed to fit. When I checked your list of ships in 1845 I found the passanger list for the brig Albion. This list contained Mari and her parents. However, the departure date is April 30 and the arrival date is July 3. The arrival date does not concern me so much as the departure date as that is a month off. In any event, I wanted to confirm that date and wonder whether ther story of the pirate chase was recorded in any fashion. Thanks for any feedback you might provide -- Kirt Johnson