"The Unladylike Adventures of Kat Stephenson" series by Stephanie Burgis

This series takes us back to the England of Jane Austen, but Kat is no dainty heroine looking for a good marriage, and she is not prepared to play second fiddle to her sisters.

She is lively, adventurous and a bit of a tomboy, and on top of that, she has magical skills- a combination set to lead her into all kinds of trouble!

A Most Improper Magick
A Tangle of Magicks
A Reckless Magick