Was Narcissa Malfoy a Death Eater?

Lucius Malfoy was a well known Death Eater and eventually Draco Malfoy became one as well. But what about Narcissa Malfoy, Lucius' wife and Draco's mother? She certainly spent a great deal of time around Voldemort and her husband, but I don't recall her ever being explicitly described as a Death Eater.

So was Narcissa Malfoy a Death Eater? Or was she a non-Death Eater permitted to be in the company of Voldemort?