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In page Batgirl:

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Mary Elizabeth "Bette" Kane is a reinvented version of the Betty Kane character during the Golden Age. As her original characterization was retconned out of existence during the Crisis on Infinite Earths storyline, a discrepancy arose where her Bat-Girl character had joined the west coast version of the Teen Titans but simply disappeared. The character was reintroduced as Bette Kane and the alias of Flamebird. Following Infinite Crisis, the character's past as Bat-Girl was hinted at as being a part of continuity. However, that reference included a revamped origin of the character and it may or may not have been the current Bette Kane.