Well the two possible means are:

1) The Princess picked up a bottle and broke it against a part of the ship - as you would do when launching a ship.

2) While the Princess was on board a ship (as a passenger) she (accidentally) broke a bottle WELLLLLLL.... The difference is... one is at the start of the question, the other is at the end of the question... see?

I have a ship in a bottle on my mantle.

Casper's Scare School - 2009 Substitute Gargoyle Ship in a Bottle 2-17 was released on:

USA: 25 October 2012

Ebay.

first, the bottle is created, just the same as any other bottle. The tricky part is inserting the ship. the ship must be made in a way that the mast and sails can be collapsible so that everything can fit through the neck of the jar. once the collapsed version of the ship is inside, it must be erected and the masts glued in place. This takes quite a bit of skill from the person who made the ship.