Sanna, Sorceress Apprentice by Roxanna Matthews
The Thon Academy of Higher Magic for Young Ladies of Exceptional Talent will make Sanna a Sorceress - if she can just learn to behave. Her talents lie in the fiber arts, such as knitting waterproof socks and self-heating mittens. She embroiders a bag that is bigger on the inside than on the outside, which she then uses to rescue a handsome slave from a fate worse than death. They fall in love at first kiss.
But a Sorceress must devote her entire life to her career. When her handsome prince proposes, Sanna must choose between love and magic.
Pattern for self-heating mittens included!