As 'Faustina' is considered a third person singular subject, you need a third-person singular verb: camina.
The other respondent, TehGOD, is incorrect in saying that 'camina' is required because 'Faustina' is a feminine name. The gender of the subject is irrelevant. If the name were masculine (Fausto), the ve rb would still be 'camina.' Verbs in Spanish agree with subjects, not with gender.
