Over The Sea — Sherwood Smith

Clair traveled about looking for girls who needed a home. She even came to Earth, where she found CJ, who did not fit. CJ found herself not only taken to another world to live, but she became the princess -- Clair's "left hand splat." One of her jobs as princess was to write down their records. Another was to serve as leader for the girls when Clair was busy learning to become queen. The girls had jobs too, as they discovered villains who thought it their business to take a kingdom away from a mere girl. From the shadowy Kwenz, a powerful mage with a very wicked past, to the usurper Glotulae and her son Prince Jonnicake, who in their ridiculous way were just as determined to boot Clair out, there were plenty of chances for adventure. And mystery, like why did kids from other times and worlds show up every now and then?

These are the early stories -- how Clair found her gang of girls, and how "the M girls" developed the fine art of the Duel to the Pie.