Bruriah is dated to the second century CE only through her documented relationships, as daughter of Hananiah ben Teradion, martyred by Rome around 135 CE, and as wife of Rabbi Meir, whose teaching activity is placed across the middle decades of the century. No Talmudic passage naming her carries an independent birth or death date, and later medieval legend about her is treated by modern scholars as a later addition rather than earliest-record testimony.
What would resolve this A datable document or independent notice naming Bruriah, distinct from the undated Talmudic anecdotes and from the death dates of her father and husband, which fix only the generation she belonged to.
OpenTalmudic chronology, history of the Mishnaic and early Tannaitic periodMichael Berenbaum and Fred Skolnik (eds.), Encyclopaedia Judaica, 2nd edition