I'm trying to find a book I read some time ago when I was younger. It was childrens/young adults. It was set in the 1800's, about a young girl from a wealthy family who had to move to live with a poor family and work in a bakery. There were pirates/privateers and I feel like there was something about a promise a privateer made in the title or featured in the description. I also feel like it was a part of a series similar to the American Girl series, though my memory is vague so I'm not certain. I've been scouring the internet for hours with no luck. Help?