The truth is, every kid is different and has their own annoyingly secret key to potty training. If you'd asked this after I potty trained my son, I would have said yes, absolutley. He was strong willed, but really wanted to go on the kiddie roller coaster at Six Flags. All it took with him was making a sticker chart for two weeks with the roller coaster as a reward and he was completely trained by the end of those two weeks. Magic!
And then there was my daughter. Sweetest little angel, eager to please, always the easier child...except when it came to potty training. She seemed willing, liked the sticker chart thing, was happy enough to sit on the toilet. But if she was doing something she liked, she just would NOT stop to go potty. It took FOREVER to get her trained. We tried every method imaginable, including giving up and letting it be her choice. Nothing worked until she was 4 and decided that she was too old to go in her pants anymore.
Your daughter may decide that the cruise is a big enough goal to train for in two weeks. She may love the idea that on a cruise ship, big girls go in the potty. If she does, awesome! Lucky you! You could always try it out during the time leading up to it. But if it seems to be a struggle, remember this is supposed to be YOUR vacation too. Spending a large portion of it in the bathroom with her, waiting for her to go so that she doesn't have an accident at dinner or at one of the shows, or running frantically to get her to a bathroom because she just realized she has to go RIGHT NOW does not sound like the relaxing vacation you deserve. Bring the pull-ups. The space they take up in the suitcase will be more than paid for by the time you don't have to spend stressing about the change in your routine undoing all of your hard work.
Good luck!