While she is present during the Battle of Hogwarts, she's not specifically captured by Voldemort or his Death Eaters.
You might be thinking of another character:
* Hermione Granger: She is captured by the Death Eaters under the guise of Bellatrix Lestrange using a powerful spell, but she escapes with the help of Harry and Ron.
It's possible you're misremembering or conflating events from different parts of the books. If you can remember any details about the capture you're thinking of, I may be able to help you pinpoint the specific event.