You might try Kristen Britain's Green Rider series. The hero is a young woman (about 21). It is an excellent fantasy series written with the teenage market in mind (although I have enjoyed it in my 60s). There are 5 books in the series. Here is a
B&N link so you can get the titles and read more about the books.
Also perhaps of interest to your daughter might be the Honor Harrington series by David Weber. There are a lot of books in this series and he also has a special series aimed directly at the young reader market, which series includes, for example, Treecat Wars. The series certainly is one that shows a strong, intelligent, and independent woman.