Prudentius portrays Eulalia of Merida in his long poem that is the earliest and best source (403, about a century after her martyrdom) as a very devout Christian girl prepared to sacrifice herself trying to prevent the persecution of the local Christians - but she's a spunky youngster, when the persecution breaks out, her parents send her to a safe house in the hills, but she escapes, makes her way back to the city, and harangues the Governor in the courtroom. The cheeky 'jokes' Prudentius puts in her mouth include thanking her torturers for writing the praise of God in purple on her skin after she'd been flogged (deep purple ink on pale purple vellum was supposed to be reserved for panegyrics to the Emperor), and thanking them for inscribing the cross of Christ on her breasts after they'd carved her with hooks. I first read about her when I was much the same age as she was and was very excited by the idea!