Here is a link to some history on the Princes Marguerite.
Princess Marguerite history
I was on the last Seattle-Victoria-Seattle trip of the Princess Marguerite under CP ownership. Even though the article above gives the date as 1974, I believe that it was 1972. Our first-born was born on 5/14/1972 and he was just a small baby at the time of this trip.
The ship was packed with people. Standing room only. The normal restrictions on where passengers could go were relaxed and I was all over the ship; down in the engine room, etc. Everywhere except on the bridge. My Wife spent most of her time in a deck chair with the baby.
I knew that Princes Marguerite had a revival under Stena Lines, but never got to ride her. I am grateful for that 1972 trip. It is a shame that she isn't still with us today.
And a Video of her last arrival in Seattle under Stena Lines operation:
Princess Marguerite arriving Seattle 9/17/1989